đề thì trắc nghiệm vi xử lý_nguyễn trọng luân

8/2/2019 th trc nghim vi x l_nguyn trng lun

1/52

Vi x l - Vi iu khin

KHOA IN T

B mn K thut My tnh

THI TRC NGHIM

MN Vi x l - Vi iu khin

Thi gian lm bi: 70 pht;

(60 cu trc nghim)

DUYT B MN

Ch : - Sinh vin lm bi c lp, khng c php s dng ti liu

- Khng vit, v vo thi, thi phi np cng bi thi

M thi2009.12.25.VDK

Cu

1 :

Cho on m Assembler sau:

MOV A, #0ABH

CLR C

ADDC A, #0BAH

Kt qu ca thanh ghi A l:A. ABH B.65HC. BAH D.66H

Cu

2 :

ROM l loi b nh bn dn c c tnh:

A. Cho php c d liu t ROM, cho php ghi d

liu vo ROM, khng mt d liu khi mt ngunin.

B.Cho php c d liu t ROM, khng cho php

ghi d liu vo ROM, mt d liu khi mt ngunin.C. Cho php c d liu t ROM, cho php ghi d

liu vo ROM, mt d liu khi mt ngun in.D.Cho php c d liu t ROM, khng cho php

ghi d liu vo ROM, khng mt d liu khi mtngun in.

Cu

3 :

Cho on chng trnh:

MOV A,#96H

MOV R0,#07H

SD1:

MOV @R0,A

RR A

DJNZ R0,SD1

Sau khi thc hin on chng trnh trn, thanh ghi R4 cha gi tr:A. 5AH B.2DHC. 96H D.D2H

Cu

4 :

Cho on chng trnh:

Page: 1


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Vi x l - Vi iu khin

ORG 00H

MOV A,#3

MOV R3,#16

MOV R0,#75XCH A,R0XCHD A,@R0

Sau khi thc hin on chng trnh, thanh ghi R3 cha gi trA. 15H B.76HC. 1BH D.40H

Cu

5 :

Cho on chng trnh:MOV R0,#7

MOV A,#15H

MOV B,#10

DIV ABSWAP AADD A,BMOV @R0,A

Sau khi thc hin on chng trnh, thanh ghi R7 cha gi trA. 7H B.15h

C. 21h D.1HCu

6 :

Loi b nh ROM cho php ta c th ghi d liu vo v xo d liu:

A. PROM B.Flash ROMC. MROM D.EPROM

Cu

7 :

B nh bn dn 8 bit c m s 27256 cho bit dung lng ca b nh ny:

A. 27256 KB B.27256 KbitC. 32 Kbit D.32 KB

Cu

8 :


MOV A, #0FFHMOV R0, #0F0HXRL A, R0

Kt qu ca thanh ghi A l:A. 00H B.0FHC. F0H D.FFH

Cu

9 :

Cho on m Assembler sau:SETB C

MOV A, #0C9HMOV R2, #54HSUBB A, R2

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Vi x l - Vi iu khin

Kt qu ca thanh ghi A l:A. 54H B.74HC. C9H D.75H

Cu

10 :


MOV A,#21

MOV B,#10


Sau khi thc hin on chng trnh, thanh ghi A cha gi tr:

A. 7 B.15hC. 21h D.1Cu

11 :

Lnh no trong s cc lnh sau y thuc nhm lnh s hc ca chip 8051:

A. INC B.XCHC. CPL D.SWAP

Cu

12 :

chn dy thanh ghi tch cc l dy 3 th cc bit RS0, RS1 phi c gi tr l bao nhiu?

A. RS0 = 1, RS1 = 1 B.RS0 = 1, RS1 = 0C. RS0 = 0, RS1 = 0 D.RS0 = 0, RS1 = 1

Cu

13 :


A. 2764 KB B.2764 KbitC. 8 bit D.8 KB

Cu

14 :


CLR C

MOV A, #0FFHMOV B, #05HSUBB A,B

Kt qu ca thanh ghi A l:A. Khng xc nh B.FAHC. 4H D.FEH

Cu

15 :


A. 6232 KB B.32 KBC. 6232 Kbit D.32 Kbit

Cu

16 :

Lnh no trong s cc lnh sau y s dng kiu nh a ch ch s:

A. MOV A,@A+DPTR B.ACALL rel

C. LCALL rel D.SJMP relCu17 :

Cho on chng trnh:

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Vi x l - Vi iu khin

MOV A,#0C3H

SETB C

MOV R0,#07H

SD1:

MOV @R0,A

RRC A

DJNZ R0,SD1

Sau khi thc hin on chng trnh trn, thanh ghi R6 cha gi tr:A. 1FH B.F8H

C. 87H D.E1HCu18 :


MOV P3, #55H

CLR P3.2

Kt qu ca thanh ghi P3 lA. 55h B.51hC. 56h D.57h

Cu

19 :

Cho bit trng thi cc c sau khi chip 8051 thc hin php ton s hc (89H + 57H)

A. CY = 0, AC = 1 B.CY = 1, AC = 1C. CY = 1, AC = 0 D.CY = 0, AC = 0

Cu

20 :

Lnh nhy n a ch rel nu ni dung thanh cha (thanh ghi A) khc 0:

A. JNZ rel B.JZ relC. JNC rel D.JC rel.

Cu

21 :

Cho on chng trnh:

MOV A,#0C3H

SETB C

MOV R0,#07H

SD1:

MOV @R0,A

RRC A

DJNZ R0,SD1

Sau khi thc hin on chng trnh trn, thanh ghi R4 cha gi tr:A. E1H B.1FH

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Vi x l - Vi iu khinC. 87H D.F8H

Cu

22 :

Chn nhn d liu ca port ni tip:

A. RXD B.TXDC. T0 D.INT0

Cu

23 :


MOV A,#15H

MOV B,#10


Sau khi thc hin on chng trnh, thanh ghi B cha gi trA. 15h B.7HC. 1H D.21h

Cu

24 :


MOV A, #56H

MOV 66H, #76HMOV R0, #66HSUBB A, @R0

Kt qu ca nh c a ch 66H l:A. 56H B.76HC. 66H D.DFH

Cu

25 :

Cho bit trng thi cc c sau khi chip 8051 thc hin php ton s hc (00H - 01H)


Cu

26 :


MOV R0,#7FH

MOV 7EH,#00H

MOV 7FH,#40H

DEC @R0

DEC R0

DEC @R0

Kt qu nh c a ch 7EH v 7FH l:A. (7EH)=00H , (7FH)=40H B.(7FH)=40F , (7FH)=00HC. (7EH)=FFH , (7FH)=3FH D.(7FH)=3FH , (7FH)=FFH

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Vi x l - Vi iu khinCu

27 :


CLR C

MOV A ,#0FFH

MOV B ,#05H

SUBB A,B

Kt qu ca thanh ghi B lA. 4H B.5HC. FAH D.FEH

Cu

28 :

Khi b nh thi s 0 trong chip 8051 ng vai tr l b m s kin (Counter) th n s nhn xung nhpt chn no ?

A. T0 B.RXDC. TXD D.INT0

Cu29 : Cho on chng trnh:

ORG 00H

MAIN:

MOV R0,#3

MOV A,R0

MOV DPTR,#CSDL

MOVC A,@A+DPTR

DEC R0

MOV @R0,A

SJMP $

CSDL:

DB 0C0H,0F9H,0A4H,0B0H,99H

DB 92H,82H,0F7H,80H,90H

end

Sau khi thc hin on chng trnh, thanh ghi R2 cha gi tr:A. 99H B.A4HC. B0H D.92H

Cu

30 :

Cho on chng trnh:

MOV A,#96H

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Vi x l - Vi iu khin

MOV R0,#07H

SD1:

MOV @R0,A

RR A

DJNZ R0,SD1

Sau khi thc hin on chng trnh trn, thanh ghi R3 cha gi tr:A. 2DH B.96HC. 69H D.5AH

Cu

31 :

Cho on chng trnh:

ORG 00H

MAIN:

MOV R0,#6

MOV A,R0

MOV DPTR,#CSDL

MOVC A,@A+DPTR

DEC R0

MOV @R0,A

SJMP $

CSDL:


DB 92H,82H,0F7H,80H,90H

end

Sau khi thc hin on chng trnh, thanh ghi R5 cha gi tr:A. F7H B.92HC. 82H D.80H

Cu

32 :

Cho on chng trnh:

ORG 00H

MOV A,#42H

MOV R5,#35

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Vi x l - Vi iu khin

MOV R0,#05HXCH A,@R0XCHD A,@R0

Sau khi thc hin on chng trnh, thanh ghi A cha gi tr:A. 45H B.32HC. 22H D.43H

Cu

33 :


MOV A, #93HMOV R0, #77HADD A, R0ADDC A, R0

Kt qu ca thanh ghi R0 lA. 93H B.77H

C. 82H D.0AHCu34 :

Loi b nh ROM cho php ta ghi d liu vo v xo d liu i bng tia cc tm:

A. MROM B.Flash ROMC. UV-EPROM D.PROM

Cu

35 :

Cho on chng trnh:MOV R7,#0D6H

MOV R0,#7

MOV A,#0FH

XRL A,@R0DEC R0

DEC R0

MOV @R0, A

Sau khi thc hin on chng trnh, thanh ghi R7 cha gi tr:A. 5 B.D9HC. D6H D.6

Cu

36 :


MOV P2, #00HCPL P2.1

CPL P2.0

Kt qu ca thanh ghi P2 l:A. 4h B.3hC. 5h D.1

Cu

37 : Cho on chng trnh:ORG 00H

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Vi x l - Vi iu khin

MAIN:

MOV R0,#7

MOV A,R0

MOV DPTR,#CSDL

MOVC A,@A+DPTR

DEC R0

MOV @R0,A

SJMP $

CSDL:


DB 92H,82H,0F7H,80H,90H

Sau khi thc hin on chng trnh, thanh ghi A cha gi tr:A. 06h B.80hC. F7h D.07h

Cu

38 :

Cho on chng trnh:

ORG 00H

MAIN:

MOV R0,#9

MOV A,R0

MOV DPTR,#CSDL

MOVC A,@A+DPTR

DEC R0

MOV @R0,A

SJMP $

CSDL:


DB 92H,82H,0F7H,80H,90H

Sau khi thc hin on chng trnh, thanh ghi A cha gi tr:

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Vi x l - Vi iu khinA. F9H B.C0HC. 90H D.A4H

Cu

39 :

Loi b nh bn dn c th mt d liu ngay khi vn cn ngun in cung cp:

A. SRAM B.PROMC. MROM D.DRAM

Cu

40 :

Cho on chng trnh:

MOV R7,#04CH

MOV R0,#7

MOV A,#0FH

ANL A,@R0

DEC R0

MOV @R0, A

Sau khi thc hin on chng trnh, thanh ghi A cho gi tr:A. 06H B.07HC. 0CH D.40H

Cu

41 :


MOV A ,#0F0H

MOV B ,#0FH

ADD A,B

Kt qu ca thanh ghi B lA. F4H B.FHC. 3H D.5H

Cu

42 :

Cho on chng trnh:

ORG 00H

MOV A,#75H

MOV R2,#3FH

MOV R0,#2XCH A,@R0XCHD A,@R0

Sau khi thc hin on chng trnh, thanh ghi A cha gi tr:A. 75H B.7FHC. 35H D.3FH

Cu

43 : Cho on m Assembler sau:MOV A ,#0C3H

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Vi x l - Vi iu khin

MOV R0 ,#0AAH

ADD A,R0

Kt qu ca c l:A. CY=0,AC=0 B.CY=1,AC=0C. CY=1,AC=1 D.CY=0,AC=1

Cu

44 :


MOV A,#0F0H

ORL A,#0FH

Kt qu ca thanh ghi A l:A. FFH B.0FHC. F0H D.00H

Cu45 : i vi chip 8051 th vng nh c dng lm ngn xp (stack) c lu gi trong

A. B nh d liu bn trong B.B nh chng trnh bn trongC. B nh chng trnh bn ngoi D.B nh d liu bn ngoi

Cu

46 :

Qu trnh lm ti (Refresh) d liu l qu trnh cn thit i vi loi b nh bn dn:

A. SRAM B.EEPROMC. Flash ROM D.DRAM

Cu

47 :


A. MROM B.Flash ROM

C. UV-EPROM D.PROMCu

48 :

Cho on chng trnh:

ORG 00H

MAIN:

MOV R0,#2

MOV A,R0

MOV DPTR,#CSDL

MOVC A,@A+DPTR

DEC R0

MOV @R0,A

SJMP $

CSDL:


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Vi x l - Vi iu khin

DB 92H,82H,0F7H,80H,90H

Sau khi thc hin on chng trnh, thanh ghi R1 cha gi tr:A. 90H B.F9HC. A4H D.C0H

Cu

49 :

B nh bn dn 8 bit c m s 62512 cho bit dung lng ca b nh ny

A. 512 KB B.62512 KbitC. 62512 KB D.512 Kbit

Cu

50 :


MOV A ,#0C3H

MOV R0 ,#0AAH

ADD A,R0

Kt qu ca thanh ghi A l:A. AAH B.6DHC. C3H D.6BH

Cu

51 :

Vng nh c dng lm ngn xp (stack) c a ch kt thc l:

A. 7FH B.FFHC. 2 FH D.08 H

Cu

52 :

Lnh so snh ni dung ca thanh ghi R0 vi mt hng s c gi tr 00H v nhy n a ch rel nu nidung ca chng khng bng nhau ( ch mc nh):

A. CJNE R0, #00H, rel B.CJNE 00H, R0, rel

C. CJNE R0, 00H, rel D.CJNE #00H, R0, relCu

53 :


MOV R0,#7

MOV A,#0FH

XRL A,@R0DEC R0

DEC R0

MOV @R0, A

Sau khi thc hin on chng trnh, thanh ghi A cha gi tr:A. D6H B.5C. D9H D.6

Cu

54 :

Lnh no trong s cc lnh sau y s dng kiu nh a ch di:

A. LCALL rel B.SJMP rel

C. ACALL rel D.MOV A,@A+DPTRCu55 :

Cho on chng trnh :

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Vi x l - Vi iu khin

MOV A,#18H

SD1:

SETB C

MOV P1,A

LCALL DELAY500MS

RRC A

JNC SD1

Sau khi thc hin on chng trnh trn ,thanh ghi A cha gi trA. E3H B.23H

C. 88H D.F1HCu56 :


A. AC = 0, P = 1 B.AC = 0, P = 0C. AC = 1, P = 0 D.AC = 1, P = 1

Cu

57 :

Lnh nhy n a ch rel nu ni dung c 0 (c zero) bng 0

A. JNC rel B.JNZ relC. JZ rel D.JC rel.

Cu

58 :

Cho on chng trnh:

MOV R7,#04CH

MOV R0,#7

MOV A,#0FH

ANL A,@R0

DEC R0

MOV @R0, A

Sau khi thc hin on chng trnh, thanh ghi R6 cho gi tr:A. 06H B.40HC. 0CH D.07H

Cu

59 :

Vi lnh Movx, thanh ghi DPTR c dng cha a ch ca nh cn truy xut thuc b nh:

A. RAM ngoi B.ROM ngoiC. ROM trong D.RAM trong

Cu

60 :

bo kt qu tnh ton ca php ton s hc (php ton c du) c nm trong khong t -127 n+128 hay khng th chip 8051 s dng c no?

A. C trn OV B.C nh ph ACC. C nh CY D.C F0Cu

61 :


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Vi x l - Vi iu khinA. 6116 KB B.16 KBC. 6116 Kbit D.16 Kbit

Cu

62 :


MOV A,#93H

MOV R0,#77H

ADD A,R0

ADDC A,R0

Kt qu ca thanh ghi R0 l:A. 93H B.77HC. 82H D.0AH

Cu

63 :


A. PROM B.Flash ROMC. MROM D.EPROMCu

64 :

Cho on chng trnh:

MOV A,#0C3H

SETB C

MOV R0,#07H

SD1:

MOV @R0,A

RLC A

DJNZ R0,SD1

Sau khi thc hin on chng trnh trn, thanh ghi R6 cha gi tr:A. E1H B.F8HC. 1FH D.87H

Cu

65 :

Lnh no trong s cc lnh sau y l lnh sai:

A. POP A B.POP DPLC. POP SP D.POP R0

Cu

66 :


MOV R1, #0F0HMOV @R1, #0FHMOV A, #0F0HADD A, @R1

Kt qu ca thanh ghi A lA. 0H B.F0HC. FEH D.FFH

Cu Lnh hon chuyn ni dung ca hai nibble (hai na 4 bit) ca thanh ghi A:

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Vi x l - Vi iu khin67 :

A. SWAP B.PULLC. POP D.PUSH

Cu

68 :

Cho on chng trnh:

ORG 00H

MAIN:

MOV R0,#7

MOV A,R0

MOV DPTR,#CSDL

MOVC A,@A+DPTR

DEC R0

MOV @R0,A

SJMP $

CSDL:


DB 92H,82H,0F7H,80H,90H

Sau khi thc hin on chng trnh, thanh ghi R0 cha gi tr:A. 80h B.07hC. 06h D.F7h

Cu

69 :



Cu

70 :

Nu thch anh dao ng gn bn ngoi chip 8051 c tn s l 12MHz th mt chu k my di:

A. 1 s B.6 sC. 12 s D.2 s

Cu

71 :

Cho on chng trnh:

ORG 00H

MAIN:

MOV R0,#7

MOV A,R0

MOV DPTR,#CSDL

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Vi x l - Vi iu khin

MOVC A,@A+DPTR

DEC R0

MOV @R0,A

SJMP $

CSDL:


DB 92H,82H,0F7H,80H,90H

Sau khi thc hin on chng trnh, thanh ghi R6 cha gi tr :A. 06h B.07h

C. F7h D.80hCu72 :


MOV A, #7FHMOV R0, #26HMOV 26H, #0AAH

ADD A, 26H

ADDC A, @R0

Kt qu ca thanh ghi R0 l:

A. D4H B.26HC. D3H D.7FH

Cu

73 :

Nu khng khi ng thanh ghi SP th vng nh ca ngn xp (stack) c a ch bt u l:

A. 08H B.80HC. 30H D.00H

Cu

74 :

Cho on chng trnh:

MOV A,#96H

MOV R0,#07H

SD1:

MOV @R0,A

RR A

DJNZ R0,SD1

Sau khi thc hin on chng trnh trn, thanh ghi A cha gi tr:

A. 5AH B.96HC. 2DH D.4BHCu

75 :

Cho on chng trnh:

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Vi x l - Vi iu khin

MOV A,#96H

MOV R0,#07H

SD1:

MOV @R0,A

RL A

DJNZ R0,SD1

Sau khi thc hin on chng trnh trn, thanh ghi R7 cha gi trA. 2DH B.A5HC. 96H D.5AH

Cu

76 :


MOV R0, #7FHMOV 7EH, #00HMOV 7FH, #40HDEC @R0

DEC R0DEC @R0

Kt qu ca thanh ghi R0 l:A. 7FH B.7EH

C. FFH D.3FHCu

77 :


A. 2716 KB B.2716 KbitC. 2 Kbit. D.2 KB

Cu

78 :

Lnh nhy n a ch rel nu ni dung thanh cha (thanh ghi A) bng 0:

A. JZ rel B.JNZ relC. JNC rel D.JC rel.

Cu

79 :



Cu

80 :

Cho bit trng thi cc c sau khi chip 8051 thc hin php ton s hc (FFH + 01H)

A. AC = 0, P = 1 B.AC = 1, P = 0C. AC = 1, P = 1 D.AC = 0, P = 0

Cu

81 :


A. MOV A, #FF0H B.MOV A, #35C. MOV A, #05H D.MOV A, #0FFH

Cu

82 : Lnh nhy no trong s cc lnh sau y c tm nhy n phi trong cng khi 2KB ca b nhchng trnhA. SJMP B.RJMPC. LJMP D.AJMP

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83 :


MOV A, #0F4H

MOV B, #0FH

ADD A,B

Kt qu ca thanh ghi B l:A. F4H B.FHC. 3H D.5H

Cu

84 :

Cho on chng trnh:

MOV R7,#6BH

MOV R0,#7

MOV A,#0F0H

XRL A,@R0DEC R0

MOV @R0, A

Sau khi thc hin on chng trnh, thanh ghi A cha gi tr:A. 06H B.6BHC. 9BH D.0F0H

Cu

85 :


A. AC = 0, OV = 0 B.AC = 0, OV = 1C. AC = 1, OV = 0 D.AC = 1, OV = 1

Cu

86 :

Lnh gim ni dung ca thanh ghi R0 v nhy n a ch rel nu ni dung ca thanh ghi R0 khc 0 (ch mc nh):

A. DJNZ R0, rel B.CJNE R0, #00H, relC. DJNZ rel, R0 D.CJNE R0, 00H, rel

Cu

87 :

Lnh nhy n a ch rel nu ni dung c nh khc 0:

A. JC rel. B.JNZ relC. JNC rel D.JZ rel

Cu

88 :

vng nh ca ngn xp (stack) c a ch bt u l 40H th thanh ghi SP phi c gi tr l:

A. 39H B.3FHC. 40H D.41H

Cu

89 :


MOV A, #0F4H

MOV B, #0FH

ADD A,BKt qu ca thanh ghi A l:

A. FH B.3H

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Vi x l - Vi iu khinC. 5H D.F4H

Cu

90 :

bo s ch s 1 trong thanh ghi A l s chn hay l th chip 8051 s dng c no?

A. C F0 B.C nh ph ACC. C trn OV D.C nh CY

Cu

91 :


A. MOV #0B0H, A B.MOV B0H, AC. MOV A, B0H D.MOV A, #0B0H

Cu

92 :


A. 4 Kbit. B.2732 KBC. 2732 Kbit D.4 KB

Cu

93 :

Thanh ghi iu khin trng thi v qu trnh hot ng ca b nh thi trong chip 8051:

A. TCON B.TIMER0C. TIMER1 D.TMOD

Cu94 : Cho on m Assembler sau:

MOV A, #0C3H

MOV R0, #0AAHADD A, R0

Kt qu ca thanh ghi R0 l:A. C3H B.AAHC. 6DH D.6BH

Cu

95 :

Lnh di chuyn ni dung ca thanh ghi R0 vo thanh ghi A:

A. MOV A, R0 B.MOVX A, R0C. MOV R0, A D.MOV A, @R0

Cu

96 :

Cho on chng trnh:

MOV R7,#6BH

MOV R0,#7

MOV A,#0F0H

XRL A,@R0DEC R0

MOV @R0, A

Sau khi thc hin on chng trnh, thanh ghi R7 cha gi tr:A. 06H B.0F0HC. 6BH D.9BH

Cu

97 :

Cho bit trng thi cc c sau khi chip 8051 thc hin php ton s hc (AAH +BDH)

A. AC = 0, P = 0 B.AC = 1, P = 1C. AC = 0, P = 1 D.AC = 1, P = 0Cu

98 :


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Vi x l - Vi iu khin

MOV R0, #20HMOV A, #3FHMOV 20H, #75H

XCH A, @R0

Kt qu ca thanh ghi A l:A. 3FH B.75HC. 20H D.57H

Cu

99 :

Lnh nhy n a ch rel nu ni dung c 0 (c zero) bng 1

A. JC rel. B.JNC relC. JNZ rel D.JZ rel

Cu

100 :

Cho on chng trnh:

MOV R7,#05CH

MOV R0,#7

MOV A,#0FH

ANL A,@R0

DEC R0

MOV @R0, A

Sau khi thc hin on chng trnh, thanh ghi R7 cho gi tr

A. 0CH B.6HC. 5CH D.7H

Cu

101 :

Cho on chng trnh:

ORG 00H

MOV A,#3

MOV R3,#16


Sau khi thc hin on chng trnh, thanh ghi A cha gi tr:A. 1BH B.15HC. 40H D.76H

Cu

102 :

Cho on chng trnh:

ORG 00H

MOV A,#7MOV R7,#3FH

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Vi x l - Vi iu khin


Sau khi thc hin on chng trnh, thanh ghi A cha gi trA. 32H B.4FHC. 2FH D.3AH

Cu

103 :


MOV A,#15H

MOV B,#10

DIV ABSWAP A

ADD A,BMOV @R0,A

Sau khi thc hin on chng trnh, thanh ghi A cha gi trA. 15h B.7HC. 21h D.1H

Cu

104 :


A. MOV #255, A B.MOV 255, AC. MOV A, #255 D.MOV A, #0FFH

Cu

105 :

Cho on chng trnh:

MOV R7,#6BH

MOV R0,#7

MOV A,#0F0H

XRL A,@R0DEC R0

MOV @R0, A

Sau khi thc hin on chng trnh, thanh ghi R0 cha gi tr:A. 0F0H B.6BHC. 06H D.9BH

Cu

106 :



Cu

107 :

Cho on chng trnh:

MOV A,#96HMOV R0,#07H

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Vi x l - Vi iu khin

SD1:

MOV @R0,A

RR A

DJNZ R0,SD1

Sau khi thc hin on chng trnh trn, thanh ghi R3 cha gi tr:A. 4BH B.2DHC. 96H D.69H

Cu

108 :

RAM l loi b nh bn dn c c tnh:

A. Cho php c d liu t RAM, khng cho phpghi d liu vo RAM, mt d liu khi mt ngunin.

B.Cho php c d liu t RAM, cho php ghi dliu vo RAM, khng mt d liu khi mt ngunin.

C. Cho php c d liu t RAM, khng cho phpghi d liu vo RAM, khng mt d liu khi mtngun in

D.Cho php c d liu t RAM, cho php ghi dliu vo RAM, mt d liu khi mt ngun in.

Cu

109 :

Cho on chng trnh:

ORG 00H

MAIN:

MOV R0,#4

MOV A,R0

MOV DPTR,#CSDL

MOVC A,@A+DPTR

DEC R0

MOV @R0,A

SJMP $

CSDL:


DB 92H,82H,0F7H,80H,90H

Sau khi thc hin on chng trnh, thanh ghi R3 cha gi tr:A. A4H B.92HC. 99H D.B0H

Cu

110 : Cho dy LED n ni vi Port 1 tch cc mc thp. Cho on chng trnhMOV A,#0FFH

Page: 22


23/52

Vi x l - Vi iu khin

CLR C

SD2:

MOV P1,A

LCALL DELAY500MS

RLC A

JC SD2

Kt qu thc hin on chng trnh:A. Dy LED n tt ui B.Dy LED n sng dnC. Dy LED n sng ui D.Dy LED n tt dn

Cu

111 :

Cho on chng trnh:

MOV A,#96H

MOV R0,#07H

SD1:

MOV @R0,A

RR A

DJNZ R0,SD1

Sau khi thc hin on chng trnh trn, thanh ghi R4 cha gi tr:A. A5H B.96HC. 0B4H D.2DH

Cu

112 :


MOV A,#0FFH

MOV R0,#0F0H

XRL A,R0

Kt qu ca thanh ghi A l:A. 0FH B.F0HC. 00H D.FFH

Cu

113 :


A. Cho php c d liu t RAM, khng cho phpghi d liu vo RAM, khng mt d liu khi mtngun in

B.Cho php c d liu t RAM, khng cho phpghi d liu vo RAM, mt d liu khi mt ngunin.

C. Cho php c d liu t RAM, cho php ghi dliu vo RAM, khng mt d liu khi mt ngunin.


Cu Lnh no trong s cc lnh sau y thuc nhm lnh r nhnh ca chip 8051:

Page: 23


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A. CJNE B.MOVC. INC D.SWAP

Cu

115 :

Lnh so snh ni dung ca nh 3FH vi ni dung ca thanh ghi A v nhy n a ch rel nu ni dungca chng khng bng nhau:

A. CJNE A, #3FH, rel B.CJNE #3FH, A, relC. CJNE 3FH, A, rel D.CJNE A,3FH, rel

Cu

116 :


A. Cho php c d liu t ROM, cho php ghi dliu vo ROM, khng mt d liu khi mt ngunin.

B.Cho php c d liu t ROM, khng cho phpghi d liu vo ROM, mt d liu khi mt ngunin.

C. Cho php c d liu t ROM, cho php ghi dliu vo ROM, mt d liu khi mt ngun in.

D.Cho php c d liu t ROM, khng cho phpghi d liu vo ROM, khng mt d liu khi mtngun in.

Cu

117 :

Khi lp trnh cho Flash ROM bn trong chip 8051, ngun in Vpp cung cp l:

A. Vpp = 21V B.Vpp = 12,5VC. Vpp = 0V D.Vpp = 5VCu

118 :


A. PROM B.Flash ROMC. MROM D.EPROM

Cu

119 :

Cho bit trng thi cc c sau khi chip 8051 thc hin php ton s hc (25H + 7DH)

A. AC = 0, OV = 0 B.AC = 1, OV = 1C. AC = 1, OV = 0 D.AC = 0, OV = 1

Cu

120 :


MOV R0,#7FH

MOV 7EH,#00H

MOV 7FH,#40H

DEC @R0

DEC R0

DEC @R0

Kt qu ca thanh ghi R0 l:A. 7FH B.7EHC. FFH D.3FH

Cu

121 :

Lnh no trong s cc lnh sau y l lnh sai

A. MOV A, ACC B.MOV A, PSWC. MOV A, TH0 D.MOV A, SBUF

Cu

122 :


A. Flash ROM B.SRAMC. EEPROM D.DRAM

Cu Lnh no trong s cc lnh sau y s dng kiu nh a ch trc tip cho ton hng ngun:

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A. MOV R0, 00H B.MOV R0, #00HC. MOV 00H, R0 D.MOV 00H, @R0

Cu

124 :


MOV A, #0C3H

MOV R0, #55HANL A, R0

Kt qu ca thanh ghi R0 lA. D7H B.55HC. 41H D.C3H

Cu

125 :

Lnh no trong s cc lnh sau y thuc nhm lnh logic ca chip 8051:

A. CPL B.SWAPC. INC D.XCH

Cu126 : Loi b nh ROM cho php ta ghi d liu vo v xo d liu i bng tn hiu in:

A. PROM B.UV-EPROMC. MROM D.Flash ROM

Cu

127 :

Lnh nhy n a ch rel nu ni dung c nh bng 0:

A. JNC rel B.JNZ relC. JZ rel D.JC rel.

Cu

128 :

Cho on chng trnh:

ORG 00H

MAIN:

MOV R0,#4

MOV A,R0

MOV DPTR,#CSDL

MOVC A,@A+DPTR

DEC R0

MOV @R0,A

SJMP $

CSDL:


DB 92H,82H,0F7H,80H,90H

Sau khi thc hin on chng trnh, thanh ghi A cha gi tr:A. 92H B.B0H

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Vi x l - Vi iu khinC. 99H D.A4H

Cu

129 :


A. Cho php c d liu t RAM, khng cho phpghi d liu vo RAM, mt d liu khi mt ngunin.

B.Cho php c d liu t RAM, khng cho phpghi d liu vo RAM, khng mt d liu khi mtngun in

C. Cho php c d liu t RAM, cho php ghi dliu vo RAM, khng mt d liu khi mt ngunin.


Cu

130 :

Cho on chng trnh:

MOV R7,#04CH

MOV R0,#7

MOV A,#0FH

ANL A,@R0

DEC R0

MOV @R0, A

Sau khi thc hin on chng trnh, thanh ghi R7 cho gi tr:A. 06H B.40HC. 4CH D.07H

Cu

131 :


A. DEC DPTR B.DEC AC. INC A D.INC DPTR

Cu

132 :


MOV A,#0F0H

ANL A,#0FH

Kt qu ca thanh ghi A l:A. 0FH B.00HC. F0H D.FFH

Cu

133 :


MOV A, #0FFHMOV R0, #0F0HXRL A, R0

Kt qu ca thanh ghi R0 l:A. 0FH B.F0HC. 00H D.FFH

Cu

134 :


CLR C

MOV A, #0FFH

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Vi x l - Vi iu khin

MOV B, #05HSUBB A,B

Kt qu ca thanh ghi B l:A. FAH B.5HC. 4H D.FEH

Cu

135 :


A. Cho php c d liu t ROM, khng cho phpghi d liu vo ROM, mt d liu khi mt ngunin.

B.Cho php c d liu t ROM, cho php ghi dliu vo ROM, khng mt d liu khi mt ngunin.

C. Cho php c d liu t ROM, cho php ghi dliu vo ROM, mt d liu khi mt ngun in.

D.Cho php c d liu t ROM, khng cho phpghi d liu vo ROM, khng mt d liu khi mtngun in.

Cu

136 :

Cho on chng trnh:

ORG 00H

MAIN:

MOV R0,#5

MOV A,R0

MOV DPTR,#CSDL

MOVC A,@A+DPTR

DEC R0

MOV @R0,A

SJMP $

CSDL:


DB 92H,82H,0F7H,80H,90H

Sau khi thc hin on chng trnh, thanh ghi R4 cha gi tr:A. 05h B.04hC. 92h D.99h

Cu

137 :



Cu

138 :

Cho on chng trnh:

ORG 00H

Page: 27


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Vi x l - Vi iu khin

MAIN:

MOV R0,#5

MOV A,R0

MOV DPTR,#CSDL

MOVC A,@A+DPTR

DEC R0

MOV @R0,A

SJMP $

CSDL:


DB 92H,82H,0F7H,80H,90H

Sau khi thc hin on chng trnh, thanh ghi R0 cha gi trA. 92h B.05hC. 04h D.99h

Cu

139 :

Cho on chng trnh:

ORG 00H

MAIN:

MOV R0,#1

MOV A,R0

MOV DPTR,#CSDL

MOVC A,@A+DPTR

DEC R0

MOV @R0,A

SJMP $

CSDL:


DB 92H,82H,0F7H,80H,90H

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Vi x l - Vi iu khin

Sau khi thc hin on chng trnh, thanh ghi A cha gi tr:A. 90H B.C0HC. F9H D.A4H

Cu

140 :


A. 2716 Kbit B.2 Kbit.C. 2716 KB D.2 KB

Cu

141 :



Cu

142 :

Cho on chng trnh:

MOV A,#96H

MOV R0,#07H

SD1:

MOV @R0,A

RR A

DJNZ R0,SD1

Sau khi thc hin on chng trnh trn, thanh ghi R1 cha gi tr:A. 5AH B.2DHC. A5H D.96H

Cu

143 :


A. 2764 KB B.8 bitC. 2764 Kbit D.8 KB

Cu

144 :


MOV R0,#7

MOV A,#0FH

XRL A,@R0DEC R0

DEC R0

MOV @R0, A

Sau khi thc hin on chng trnh, thanh ghi R0 cha gi tr:A. D9H B.5C. 6 D.D6H

Cu Cho on m Assembler sau:

Page: 29


30/52


MOV R1, #0F0H

MOV @R1, #0FH

MOV A, #0F1H

ADD A, @R1

Kt qu ca thanh ghi R1 l:A. EFH B.F1HC. FFH D.0h

Cu

146 :


MOV A, #0C3HMOV R0, #0AAH

ADD A, R0

Kt qu ca c l:A. CY = 0, AC = 0 B.CY = 1, AC = 0C. CY = 1, AC = 1 D.CY = 0, AC = 1

Cu

147 :


MOV P2 , #0FFH

CPL P2.0

Kt qu ca thanh ghi P2 l:A. FFH B.FEHC. 0H D.Khng xc nh

Cu

148 :

Loi b nh ROM cho php ta ghi d liu vo v xo d liu i bng tn hiu in:

A. PROM B.MROMC. UV-EPROM D.Flash ROM

Cu

149 :



Cu

150 :

Loi b nh ROM cho php ta ghi d liu vo v xo d liu i bng tn hiu in:

A. UV-EPROM B.MROMC. PROM D.Flash ROM

Cu

151 :

Cho bit trng thi cc c sau khi chip 8051 thc hin php ton s hc (C5H + B6H)


Cu

152 :

Cho on chng trnh:

MOV A,#96HMOV R0,#07H

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Vi x l - Vi iu khin

SD1:

MOV @R0,A

RR A

DJNZ R0,SD1

Sau khi thc hin on chng trnh trn, thanh ghi R6 cha gi tr:A. 5AH B.A5HC. 2DH D.96H

Cu

153 :

Cho on chng trnh:

MOV A,#0C3H

SETB C

MOV R0,#07H

SD1:

MOV @R0,A

RRC A

DJNZ R0,SD1

Sau khi thc hin on chng trnh trn, thanh ghi R5 cha gi tr:A. E1H B.1FHC. 87H D.F0H

Cu

154 :


MOV R0,#7

MOV A,#0FH

XRL A,@R0DEC R0

DEC R0

MOV @R0, A

Sau khi thc hin on chng trnh, thanh ghi R6 cha gi tr:A. 5 B.D6HC. 6 D.D9H

Cu

155 :



Cu Cho on chng trnh:

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32/52


ORG 00H

MAIN:

MOV R0,#2

MOV A,R0

MOV DPTR,#CSDL

MOVC A,@A+DPTR

DEC R0

MOV @R0,A

SJMP $

CSDL:


DB 92H,82H,0F7H,80H,90H

Sau khi thc hin on chng trnh, thanh ghi A cha gi tr:A. F9H B.C0H

C. A4H D.90HCu

157 :


SETB C

MOV A, #56H

MOV 66H, #76HMOV R0, #66H

SUBB A, @R0

Kt qu ca thanh ghi A l:A. 56H B.DFHC. 66H D.E0H

Cu

158 :

Cho on chng trnh:

MOV A,#96H

MOV R0,#07H

SD1:

MOV @R0,A

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Vi x l - Vi iu khin

RR A

DJNZ R0,SD1

Sau khi thc hin on chng trnh trn, thanh ghi R5 cha gi tr:A. 2DH B.A5HC. 5AH D.96H

Cu

159 :

Thanh ghi iu khin ch hot ng ca b nh thi trong chip 8051:

A. TMOD B.TIMER1C. TIMER0 D.TCON

Cu

160 :


MOV A,#0C5H

SWAP A

ADD A,#32H

Kt qu ca thanh ghi A l:A. C5H B.32HC. 8EH D.E8H

Cu

161 :


MOV R0, #20HMOV A, #36HMOV 20H, #75H

XCHD A, @R0

Kt qu ca thanh ghi A l:A. 76H B.35HC. 36H D.75H

Cu

162 :

Lnh no trong s cc lnh sau y s dng kiu nh a ch gin tip cho ton hng ngun

A. MOV 00H, R0 B.MOV 00H, @R0C. MOV 01h, 00H D.MOV R0, #00H

Cu

163 :


CLR C

MOV A ,#0FFH

MOV B ,#05H

SUBB A,B

Kt qu ca thanh ghi A l:A. FEH B.FAH

C. 4H D.Khng xc nhCu164 :


Page: 33


34/52

Vi x l - Vi iu khin

MOV R1,#0F0H

MOV @R1,#0FH

MOV A ,#0F0H

ADD A,@R1

Kt qu ca thanh ghi A lA. 0H B.F0HC. FFH D.FEH

Cu

165 :



Cu

166 :



Cu

167 :


MOV A,#21

MOV B,#10

DIV AB

SWAP AADD A,BMOV @R0,A

Sau khi thc hin on chng trnh, thanh ghi B cha gi tr:A. 15h B.21hC. 1 D.7

Cu

168 :

Chip 8051 c bao nhiu port xut nhp d liu di dng song song?

A. 4 B.1C. 2 D.3

Cu

169 :

Cho on chng trnh:

MOV A,#0C3H

SETB C

MOV R0,#07H

SD1:

MOV @R0,ARLC A

Page: 34


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Vi x l - Vi iu khin

DJNZ R0,SD1

Sau khi thc hin on chng trnh trn, thanh ghi R7 cha gi tr:A. 3CH B.3EHC. 7CH D.C3H

Cu

170 :

Chn pht d liu ca port ni tip:

A. TXD B.T0C. RXD D.INT0

Cu

171 :

Lnh no trong s cc lnh sau y s dng kiu nh a ch tuyt i:

A. ACALL rel B.SJMP relC. LCALL rel D.MOV A,@A+DPTR

Cu

172 :

Lnh no trong s cc lnh sau y s dng kiu nh a ch thanh ghi cho ton hng ngun:

A. MOV 00H, R0 B.MOV 00H, @R0

C. MOV R0, 00H D.MOV R0, #00HCu173 :


MOV P1, #0FFH

CLR P1.0

Kt qu ca thanh ghi P1 l:A. FFH B.FEHC. Khng xc nh D.0H

Cu

174 :

Lnh no trong s cc lnh sau y s dng kiu nh a ch tc thi cho ton hng ngun:

A. MOV R0, #00H B.MOV 00H, R0C. MOV 00H, @R0 D.MOV R0, 00H

Cu

175 :



Cu

176 :


MOV A,#0C3H

MOV R0,#55H

ANL A, R0

Kt qu ca thanh ghi R0 l:A. C3H B.55HC. 41H D.D7H

Cu

177 :

Lnh no trong s cc lnh sau y thuc nhm lnh di chuyn d liu ca chip 8051 ?

A. XCH B.INC

C. SWAP D.CPLCu178 :

Lnh nhy no trong s cc lnh sau y c tm nhy n l 128 byte trc lnh v 127 byte sau lnh:

A. RJMP B.SJMP

Page: 35


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Vi x l - Vi iu khinC. AJMP D.LJMP

Cu

179 :

Lnh nhy no trong s cc lnh sau y c tm nhy n l bt c ni no trong khng gian b nhchng trnh 64KB.

A. LJMP B.AJMPC. RJMP D.SJMP

Cu

180 :

Lnh ly d liu ra t vng nh ngn xp (Stack):

A. POP B.PUSHC. PULL D.SWAP

Cu

181 :



Cu

182 :


A. 62512 Kbit B.62512 KBC. 512 KB D.512 Kbit

Cu183 : B nh bn dn 8 bit c m s 2732 cho bit dung lng ca b nh ny

A. 4 Kbit. B.2732 KBC. 2732 Kbit D.4 KB

Cu

184 :

Cho on chng trnh:

ORG 00H

MOV A,#7

MOV R7,#3FH


Sau khi thc hin on chng trnh, thanh ghi R7 cha gi trA. 32H B.2FHC. 3AH D.4FH

Cu

185 :

Cho on chng trnh:

MOV A,#96H

MOV R0,#07H

SD1:

MOV @R0,A

RR A

DJNZ R0,SD1

Sau khi thc hin on chng trnh trn, thanh ghi R2 cha gi tr:A. 5AH B.2DHC. 4BH D.96H

Page: 36


37/52


186 :

Cho on chng trnh:

ORG 00H

MOV A,#42H

MOV R5,#35

MOV R0,#05HXCH A,@R0XCHD A,@R0

Sau khi thc hin on chng trnh, thanh ghi R5 cha gi tr:A. 22H B.45HC. 43H D.32H

Cu

187 :

Lnh di chuyn gi tr 7FH vo nh c a ch 7FH:

A. MOV 7FH, #7FH B.MOV #7FH, #7FHC. MOV #7FH, 7FH D.MOV 7FH, 7FHCu

188 :


MOV A ,#04H

MOV B ,#0FH

ADD A,B

Kt qu ca thanh ghi A l:

A. 3H B.13HC. F4H D.FH

Cu

189 :



Cu

190 :

Cho on chng trnh:

ORG 00H

MAIN:

MOV R0,#5

MOV A,R0

MOV DPTR,#CSDL

MOVC A,@A+DPTR

DEC R0

MOV @R0,A

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Vi x l - Vi iu khin

SJMP $

CSDL:


DB 92H,82H,0F7H,80H,90H

Sau khi thc hin on chng trnh, thanh ghi A cha gi tr:A. 05h B.04hC. 92h D.99h

Cu

191 :

Cho on chng trnh:

ORG 00H

MAIN:

MOV R0,#8

MOV A,R0

MOV DPTR,#CSDL

MOVC A,@A+DPTR

DEC R0

MOV @R0,A

SJMP $

CSDL:


DB 92H,82H,0F7H,80H,90H

Sau khi thc hin on chng trnh, thanh ghi R7 cha gi tr:A. 92H B.82HC. 80H D.F7H

Cu

192 :


A. 62128 Kbit B.128 KBC. 62128 KB D.128 Kbit

Cu

193 :

ch ngun gim (Power down) th in p chn Vcc ca chip 8051 l bao nhiu volt?

A. 2V B.4VC. 3V D.5V

Cu

194 : Lnh so snh ni dung ca nh 00H vi mt hng s c gi tr 00H v nhy n a ch rel nu nidung ca chng khng bng nhau ( ch mc nh):A. CJNE R0, #00H, rel B.CJNE 00H, R0, relC. CJNE R0, 00H, rel D.CJNE #00H, R0, rel

Page: 38


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195 :


MOV P2 ,#00H

CPL P2.1

CPL P2.0

Kt qu ca thanh ghi P2 l:A. 5H B.3HC. 4H D.1H

Cu

196 :


A. SRAM B.PROMC. MROM D.DRAM

Cu

197 :

Cho on chng trnh :

MOV A,#18H

SETB C

SD1:

MOV P1,A

LCALL DELAY500MS

RLC A

JNC SD1

Sau khi thc hin on chng trnh trn ,thanh ghi A cha gi tr :A. 11H B.C4HC. 23H D.88H

Cu

198 :


MOV R0, #7FHMOV 7EH, #00HMOV 7FH, #40HDEC @R0

DEC R0DEC @R0

Kt qu ca nh c a ch 7EH v 7FH l:A. ( 7EH ) = 00H, ( 7FH ) = 40H B.( 7EH ) = FFH, ( 7FH ) = 3FHC. ( 7EH ) = 40H, ( 7FH ) = 00H D.( 7EH ) = 3FH, ( 7FH ) = FFH

Cu

199 :

Cho bit trng thi cc c sau khi chip 8051 thc hin php ton s hc (B4H + 8BH)

A. AC = 0, OV = 1 B.AC = 0, OV = 0C. AC = 1, OV = 0 D.AC = 1, OV = 1Cu

200 :


Page: 39


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Vi x l - Vi iu khin

MOV A,#0C3H

MOV R0,#55H

ANL A, R0

Kt qu ca thanh ghi A l:A. C3H B.41HC. 55H D.D7H

Cu

201 :


A. EEPROM B.Flash ROMC. SRAM D.DRAM

Cu

202 :


MOV A ,#0C3H

MOV R0 ,#0AAH

ADD A,R0

Kt qu ca c l:A. AC=0,OV=0 B.AC=0,OV=1C. AC=1,OV=0 D.AC=1,OV=1

Cu

203 :


A. MROM B.PROM

C. SRAM D.DRAMCu

204 :

ch ngh (Idle) th in p chn Vcc ca chip 8051 l bao nhiu volt?

A. 5V B.4VC. 2V D.3V

Cu

205 :

Cho on chng trnh :

MOV A,#18H

SD1:

SETB C

MOV P1,A

LCALL DELAY500MS

RLC A

JNC SD1

Sau khi thc hin on chng trnh trn ,thanh ghi A cha gi tr :A. 23H B.8FHC. E3H D.F1H

Cu Cho on chng trnh:

Page: 40


41/52


MOV A,#96H

MOV R0,#07H

SD1:

MOV @R0,A

RR A

DJNZ R0,SD1

Sau khi thc hin on chng trnh trn, thanh ghi R7 cha gi tr:A. 5AH B.A5HC. 96H D.2DH


ORG 00H

MAIN:

MOV R0,#8

MOV A,R0

MOV DPTR,#CSDL

MOVC A,@A+DPTR

DEC R0

MOV @R0,A

SJMP $

CSDL:


DB 92H,82H,0F7H,80H,90H

Sau khi thc hin on chng trnh, thanh ghi A cha gi tr:A. 92H B.F7HC. 80H D.82H

Cu

208 :

Cho on chng trnh:

MOV A,#0C3H

SETB C

Page: 41


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Vi x l - Vi iu khin

MOV R0,#07H

SD1:

MOV @R0,A

RRC A

DJNZ R0,SD1

Sau khi thc hin on chng trnh trn, thanh ghi R7 cha gi tr:A. 7CH B.C3HC. 3EH D.3CH

Cu

209 :


MOV A, #7FH

MOV R0, #26HMOV 26H, #0AAHADD A, 26H

ADDC A, @R0

Kt qu ca thanh ghi A lA. D4H B.29HC. 7FH D.D3H

Cu

210 :


MOV A, #0C3HMOV R0, #55HANL A, R0

Kt qu ca thanh ghi A l:A. D7H B.41HC. C3H D.55H

Cu

211 :

Cho on chng trnh:

ORG 00H

MAIN:

MOV R0,#6

MOV A,R0

MOV DPTR,#CSDL

MOVC A,@A+DPTR

DEC R0MOV @R0,A

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Vi x l - Vi iu khin

SJMP $

CSDL:


DB 92H,82H,0F7H,80H,90H

Sau khi thc hin on chng trnh, thanh ghi A cha gi tr:A. F7H B.92HC. 82H D.80H

Cu

212 :



Cu

213 :


A. 64 Kbit B.27512 KBC. 27512 Kbit D.64 KB

Cu

214 :


MOV A,#15H

MOV B,#10

DIV AB


Sau khi thc hin on chng trnh, thanh ghi R0 cha gi trA. 1H B.21hC. 7H D.15h

Cu

215 :


MOV A, #7FHMOV R0, #26HMOV 26H, #0AAH

ADD A, 26H

ADDC A, @R0

Kt qu ca nh c a ch 26H l:A. 7FH B.AAHC. D3H D.26H

Cu

216 :


A. 6232 Kbit B.32 KBC. 6232 KB D.32 KbitCu

217 :


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Vi x l - Vi iu khin

MOV R1,#0F0H

MOV@R1,#0FH

MOV A ,#0F0H

ADD A,@R1

Kt qu ca thanh ghi R1 lA. 0H B.F0HC. FEH D.FFH

Cu

218 :

Cho on chng trnh:

ORG 00H

MAIN:

MOV R0,#3

MOV A,R0

MOV DPTR,#CSDL

MOVC A,@A+DPTR

DEC R0

MOV @R0,A

SJMP $

CSDL:


DB 92H,82H,0F7H,80H,90H

Sau khi thc hin on chng trnh, thanh ghi A cha gi tr:A. A4H B.92HC. B0H D.99H

Cu

219 :



Cu

220 :


MOV A,#21

MOV B,#10

DIV AB

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Vi x l - Vi iu khin


Sau khi thc hin on chng trnh, thanh ghi R0 cha gi tr:A. 15h B.1HC. 7H D.21h

Cu

221 :

Thanh ghi DPTR l mt thanh ghi:

A. 16 bit B.32 bitC. 4 bit D.8 bit

Cu

222 :

Cho on chng trnh:

ORG 00H

MAIN:

MOV R0,#0

MOV A,R0

MOV DPTR,#CSDL

MOVC A,@A+DPTR

DEC R0

MOV @R0,A

SJMP $

CSDL:


DB 92H,82H,0F7H,80H,90H

Sau khi thc hin on chng trnh, thanh ghi A cha gi tr:A. 90H B.F9HC. C0H D.Khng xc nh

Cu

223 :

Cho on chng trnh:

ORG 00H

MOV A,#75H

MOV R2,#3FHMOV R0,#2XCH A,@R0

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Vi x l - Vi iu khin

XCHD A,@R0

Sau khi thc hin on chng trnh, thanh ghi R2 cha gi tr:A. 75H B.35HC. 7FH D.3FH

Cu

224 :


A. 27256 Kbit B.32 KbitC. 27256 KB D.32 KB

Cu

225 :


MOV A, #0C9HMOV R2, #54HSUBB A, R2

Kt qu ca thanh ghi R2 l:A. C9H B.54HC. 75H D.74H

Cu

226 :


MOV A, #0C3HMOV R0, #0AAHADD A, R0

Kt qu ca c lA. AC = 0, OV = 0 B.AC = 0, OV = 1

C. AC = 1, OV = 0 D.AC = 1, OV = 1Cu

227 :


MOV A, #0C3H

MOV 20H,#77HADD A, 20H

ADDC A, 20H

Kt qu ca thanh ghi A lA. C3H B.B2HC. 20H D.77H

Cu

228 :


MOV P2, #0FFH

CPL P2.0

Kt qu ca thanh ghi P2 l:A. 0H B.FEH

C. FFH D.Khng xc nhCu229 :


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Vi x l - Vi iu khin

MOV R0,#20H

MOV A,#3FH

MOV 20H,#75H

XCHD A,@R0

Kt qu ca thanh ghi A l:A. 76H B.75HC. 35H D.36H

Cu

230 :


MOV A ,#0C3H

MOV R0 ,#0AAH

ADD A,R0

Kt qu ca thanh ghi R0 l:A. C3H B.AAHC. 6DH D.6BH

Cu

231 :

Lnh ct d liu vo vng nh ngn xp (Stack):

A. PUSH B.PULLC. POP D.SWAP

Cu

232 :

Lnh no trong s cc lnh sau y s dng kiu nh a ch tng i

A. SJMP rel B.MOV A,@A+DPTRC. ACALL rel D.LCALL rel

Cu

233 :



Cu

234 :



Cu

235 :


MOV A, #93HMOV R0, #77HADD A, R0ADDC A, R0

Kt qu ca thanh ghi A l:A. 93H B.82HC. 77H D.0AH

Cu

236 : Cho bit trng thi cc c sau khi chip 8051 thc hin php ton s hc (56H + AAH)A. AC = 0, P = 0 B.AC = 1, P = 0C. AC = 0, P = 1 D.AC = 1, P = 1

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237 :

Cho on chng trnh:

MOV A,#96H

MOV R0,#07H

SD1:

MOV @R0,A

RL A

DJNZ R0,SD1

Sau khi thc hin on chng trnh trn, thanh ghi A cha gi trA. 96H B.2DHC. 4BH D.5AH


MOV A,#96H

MOV R0,#07H

SD1:

MOV @R0,A

RR A

DJNZ R0,SD1

Sau khi thc hin on chng trnh trn, thanh ghi R1 cha gi tr:A. 2DH B.A5HC. 4BH D.A05H

Cu

239 :


MOV A, #56HMOV 66H, #76HMOV R0, #66HSUBB A, @R0

Kt qu ca thanh ghi R0 lA. E0H B.66HC. 56H D.DFH

Cu

240 :

Lnh no trong s cc lnh sau y thuc nhm lnh x l bit ca chip

8051:A. SWAP B.XCH

C. INC D.CPLCu241 :

Cho bit trng thi cc c sau khi chip 8051 thc hin php ton s hc (C3H + AAH)

A. CY = 1, AC = 0 B.CY = 0, AC = 1

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Vi x l - Vi iu khinC. CY = 0, AC = 0 D.CY = 1, AC = 1

Cu

242 :

Cho on chng trnh:

MOV R7,#6BH

MOV R0,#7

MOV A,#0F0H

XRL A,@R0DEC R0

MOV @R0, A

Sau khi thc hin on chng trnh, thanh ghi R6 cha gi tr:A. 06H B.0F0HC. 9BH D.6BH

Cu243 : Cho on m Assembler sau:

MOV A, #0C3H

MOV 20H, #77HADD A, 20H

ADDC A, 20H

Kt qu ca nh c a ch 20H l:A. C3H B.77H

C. 20H D.B2HCu

244 :


MOV A, #0F0H

ANL A, #0FH

Kt qu ca thanh ghi A lA. 0FH B.00HC. F0H D.FFH

Cu

245 :


SETB C

MOV A,#0C9H

MOV R2,#04H

SUBB A, R2

Kt qu ca thanh ghi A l:

A. 75H B.54HC. C4H D.74HCu

246 :

Cho bit trng thi cc c sau khi chip 8051 thc hin php ton s hc (A7H + 2FH)

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Vi x l - Vi iu khinA. AC = 1, OV = 1 B.AC = 1, OV = 0C. AC = 0, OV = 0 D.AC = 0, OV = 1

Cu

247 :



Cu

248 :

nhn bit c tn hiu ngt 0 t ngun bn ngoi hay khng th chip 8051 s dng chn no ?

A. INT0 B.TXDC. RXD D.T0

Cu

249 :

Cho on chng trnh:

MOV R7,#04CH

MOV R0,#7

MOV A,#0FH

ANL A,@R0

DEC R0

MOV @R0, A

Sau khi thc hin on chng trnh, thanh ghi R0 cho gi tr:A. 4CH B.07HC. 06H D.40H

Cu

250 :


A. MROM B.Flash ROMC. UV-EPROM D.PROM

Cu

251 :


MOV A, #0C5HSWAP A

ADD A, #32H

Kt qu ca thanh ghi A l:A. 32H B.8EHC. E8H D.C5H

Cu

252 :


SETB C

MOV A,#0C9H

MOV R2,#04H

SUBB A, R2Kt qu ca thanh ghi R2 l:

A. C9H B.54H

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Vi x l - Vi iu khinC. 04H D.75H

Cu

253 :

Cho on chng trnh :

MOV A,#18H

SETB C

SD1:

MOV P1,A

LCALL DELAY500MS

RRC A

JNC SD1

Sau khi thc hin on chng trnh trn ,thanh ghi A cha gi tr :A. C4H B.88HC. 23H D.11H

Cu

254 :

Cho on chng trnh :

MOV A,#0FEH

SETB C

MOV R0,#07H

SD1:

MOV @R0,A

RRC A

DJNZ R0,SD1

Sau khi thc hin on chng trnh trn ,thanh ghi A cha gi tr :A. F7H B.BFHC. 7FH D.FBH

Cu

255 :

Cho on chng trnh:

MOV A,#0C3H

SETB C

MOV R0,#07H

SD1:

MOV @R0,ARLC A

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Vi x l - Vi iu khin

DJNZ R0,SD1

Sau khi thc hin on chng trnh trn, thanh ghi R5 cha gi tr:A. F0H B.87HC. 1FH D.0FH

Cu

256 :



Cu

257 :


MOV A,#93H

MOV R0,#77H

ADD A,R0

ADDC A,R0

Kt qu ca thanh ghi A l:A. 77H B.82HC. 93H D.0AH

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