单片机读程序题题库答案

1、四、阅读以下程序，注释并填写指令执行后的结果每题10分1、 ORG 0 LJMP START ；跳转到PC0030H处 ORG 30HSTART：MOV R0,#20H ；20H>R0 (R0)=20H MOV R1,#30H ； #30H>R1 (R1)=30H MOV A,R0 ；(R0)>A (A)=20H ADD A,#36H ；(A)+#36H>A (A)=56H MOV P1,A ；(A)>P1 (P1)=56H INC R0 ；(R0)+1>R0 (R0)=21H INC R1 ；(R1)+1>R0 (R1)=31H ANL A,R1 ；

2、(A)&(R1)>A (A)=10H SWAP A ；累加器A的上下4位交换 (A)=01H PUSH ACC ；累加器A内容压栈 MOV P1,A ；(A)>P1 (P1)=01H POP B ；堆栈内容出栈到B存放器 (B)=01H MOV R0,A ；(A)>R0 (R0)=01H MOV DPTR，2200H ；#2200H>DPTR (DPTR)=2200H SETB C ；1>Cy (Cy)=1 ADDC A,0 ；(A)+0+(Cy)>A (A)=02H MOVX DPTR,A ；(A)>(DPTR) (2200H)=02H EN

3、D(R0)= 01H (R1)= 31H (P1)= 01H (B)= 01H (2200H)= 02H 2、 ORG 0 LJMP START ；跳转到(PC)=0030H处 ORG 30H START：MOV SP,#50H ；#50H>SP (SP)=50HMOV R2,#10H ；#10H>R2 (R2)=10H MOV DPTR,#3000H ；#3000H>DPTR (DPTR)=3000H CRL A ；0>A (A)=0 LOOP： MOVX DPTR,A ；(A)>(DPTR) INC DPTR ；(DPTR)+1>DPTR DJNZ R2

4、,LOOP ；(R2)-1>R2 假设(R2)不等于零那么转移到LOOP处 INC DPH ；(DPH)+1>DPH (DPH)=31H (R2)=00H (DPL)=10H INC DPH ；(DPH)+1>DPH (DPH)=32H MOV 20H,#36H ；#36H>(20H) (20H)=36H SETB 00H ；位地址00H置1 20H.0=1 (20H)=37H MOV A,20H ；(20H)>A (A)=37H MOVX DPTR,A ；(A)>(DPTR) (DPTR)=3210H (3210H)=37H INC A ；(A)+1>

5、;A (A)=38H INC A ；(A)+1>A (A)=39H PUSH ACC ；累加器A内容压栈 (SP)=51H XCH A,R2 ；累加器A的内容与R2内容互换 (A)=00H (R2)=39H POP DPH ；堆栈内容弹到DPH (DPH)=39H ADD A,#55H ；(A)+#55H>A (A)=55H PUSH ACC ；累加器A内容压栈 END(A)= 55H (R2)= 39H (20H)= 37H (DPTR)= 3910H (SP)= 51H 3、 ORG 0 LJMP START ；跳转到(PC)=0030H处 ORG 30HSTART：MOV R

6、0,#30H ；#30H>R0 (R0)=30H MOV A,#12H ；#12H>A (A)=12H SETB C ；(Cy)=1 ADDC A,R0 ；(A)+(R0)+Cy>A (A)=43H MOV R0,A ；(A)>(R0) (30H)=43H SWAP A ；累加器A上下4位交换 (A)=34H INC A ；(A)+1>A (A)=35H MOV DPTR,#2000H ；#2000H>DPTR (DPTR)=2000H INC DPH ；(DPH)+1>DPH (DPH)=21H MOV P1,A ；(A)>P1 (P1)=35

7、H INC A ；(A)+1>A (A)=36H MOVX DPTR,A ；(A)>(DPTR) (2100H)=36H XCH A,R0 ； (A)óR0 (A)=30H (R0)=36H RL A ；累加器A内容循环左移 (A)=60H PUSH ACC ；累加器A的内容入栈 RL A ；累加器A内容循环左移 (A)=0C0H POP ACC ；堆栈内容弹出到累加器A (A)=60H END(A)= 60H (R0)= 36H (DPTR)= 2100H (P1)= 35H (30H)= 43H 4、 ORG 0 LJMP START ；跳转到(PC)=0030H处

8、ORG 30H START： MOV SP,#50H ；#50H>SP (SP)=50H MOV DPTR,#3000H ；#3000H>DPTR (DPTR)=3000H MOV R0,#20H ；#20H>R0 (R0)=20H MOV A,#23H ；#23H>A (A)=23H MOV R2,#0FH ；#0FH>R2 (R2)=0FH SETB 01H ；置位20H.1 (20H.1)=1 SETB C ；置位Cy (Cy)=1 ADDC A,R0 ；(A)+(R0)+Cy>A (A)=26H INC R0 ；(R0)+1>R0 (R0)=2

9、1H MOV R0,A ；(A)>(R0) (21H)=26HLOOP： DJNZ R2, LOOP ；(R2)-1>R2 假设R2内容不等于零那么转移 SWAP A ；累加器A内容的上下4位交换 (A)=62H PUSH ACC ；累加器A内容入栈 INC DPH ；(DPH)+1>DPH (DPH)=31H MOVX DPTR,A ；(A)>(DPTR) (3100H)=62H POP B ；堆栈内容弹出到B (B)=62H RR A ；累加器A内容循环右移 (A)=31H ADD A,B ；(A)+(B)>A (A)=93H MOV P1,A ；(A)>

10、;P1 (P1)=93H END(21H)= 26H (R2)= 00H (A)= 93H (B)= 62H (3100H)= 62H 5、 ORG 0 LJMP START ；跳转到PC0030H处 ORG 30H START： MOV DPTR,#1000H ；#1000H>DPTR (DPTR)=1000H MOV A,#13H ；#13H>A (A)=13H MOV R0,#20H ；#20H>R0 (R0)=20H SETB C ；1>Cy (Cy)=1 MOV R0,A ；(A)>(R0) (20H)=13H RLC A ；累加器A的内容带进位循环左移

11、 (A)=27H XCH A,R0 ；累加器A的内容与20H单元的内容互换 (A)=13H (20H)=27H PUSH ACC ；累加器A的内容入栈 POP DPL ；堆栈内容弹出到DPL (DPL)=13H MOVX DPTR,A ；(A)>(DPTR) (1013H)=13H DEC A ；(A)1>A (A)=12H PUSH DPH ；DPH内容压栈 POP B ；堆栈内容弹出到B (B)=10H ADD A,B ；(A)+(B)>A (A)=22H MOV P1,A ；(A)>P1 (P1)=22H CLR A ；累加器A内容清零 ADD A,B ；(A)+

12、(B)>A (A)=10H END(P1)= 22H (B)= 10H (20H)= 27H (DPTR)= 1013H (R0)= 20H 6、 ORG 0 LJMP START ；跳转到PC0030H处 ORG 30H START：MOV SP,#50H ；#50H>SP (SP)=50H MOV R0,#20H ；#20H>R0 (R0)=20H MOV R2,#10H ；#10H>R2 (R2)=10H MOV A,#24H ；#24H>A (A)=24H LOOP： MOV R0,A ；(A)>(R0) INC R0 ；(R0)+1>R0 D

13、JNZ R2,LOOP ；(R2)-1>R2 假设R2内容不等于0那么跳转到LOOP处 SETB 00H ；1>位地址为00H的位 (20H.0)=1 (20H)=25H SETB C ；1>Cy (Cy)=1 ADDC A,#00H ；(A)+00H+(Cy)>A (A)=25H SWAP A ；累加器A内容上下四位互换 (A)=52H PUSH ACC ；累加器A内容压栈 POP DPH ；堆栈内容弹出到DPH (DPH)=52H PUSH ACC ；累加器A内容压栈 POP B ；堆栈内容弹出到B (B)=52H MOV A,R2 ；(R2)>A (A)=0

14、0H MOV DPL,A ；(A)>DPL (DPL)=00H MOV A,B ; (B)>A (A)=52H PUSH ACC ；累加器A内容压栈 (SP)=51H END(A)= 52H (R2)= 00H (20H)= 25H (DPTR)= 5200H (SP)= 51H 7、 ORG 0 LJMP START ；跳转到PC0030H处 ORG 30HSTART： MOV DPTR,#2100H ；#2100H>DPTR (DPTR)=2100H CLR A ；0>A (A)=00H MOV R1,#30H ；#30H>R1 (R1)=30H SETB C

15、 ；1>Cy (Cy)=1 ADDC A,R1 ；(A)+(R1)+Cy>A (A)=31H MOV R1,A ；(A)>(R1) (30H)=31H PUSH ACC ；累加器A的内容压栈 POP DPL ；堆栈内容弹出到DPL (DPL)=31H RR A ；累加器A的内容循环右移 (A)=98H MOV R0,A ；(A)>R0 (R0)=98H ORL A,#24H ；(A) or 24H>A (A)=0BCH MOV P1,A ；(A)>P1 (P1)=0BCH SWAP A ；累加器A的内容上下四位交换 (A)=0CBH MOV DPH,A ；(

16、A)>DPH (DPH)=0CBH MOV B,#02H ；#02H>B (B)=02H ADD A,B ；(A)+(B)>A (A)=0CDH CLR ACC.3 ；0>ACC.3 (A)=0C5H SWAP A ；累加器A的内容上下四位交换 (A)=5CH END(A)= 5CH (R0)= 98H (DPTR)= 0CB31H (P1)= 0BCH (30H)= 31H 8、 ORG 0 LJMP START ；跳转到PC0030H处 ORG 30H START： MOV SP,#50H ；#50H>SP (SP)=50H MOV R3,#10H ；#10H

17、>R3 (R3)=10H CLR A ；累加器A内容清零 (A)=00H MOV R0,#20H ；#20H>R0 (R0)=20H LOOP： MOV R0,A ；(A)>(R0) (20H)=00H INC R0 ；(R0)+1>R0 (20H)=01H DJNZ R3,LOOP ；(R3)-1>R3 假设R3不等于零那么跳转到LOOP处 SETB 00H ；1>位地址00H位 (20H.0)=1 (20H)=01H SETB C ；1>Cy (Cy)=1 SUBB A,#00H ；(A)-00H-Cy>A (A)=0FFH MOV DPL,

18、A ；(A)>DPL (DPL)=0FFH PUSH ACC ；累加器A的内容压栈 MOV A,R3 ；(R3)>A (A)=00H MOV DPH,A ；(A)>DPH (DPH)=00H POP ACC ；堆栈内容弹出到A (A)=0FFH MOVX DPTR,A ；(A)>(DPTR) (00FFH)=0FFH ANL A,#55H ；(A) and 55H>A (A)=55H PUSH ACC ；累加器A的内容压栈 (SP)=51H CLR A ；累加器A内容清零 (A)=00H END(A)= 00H (R3)= 00H (20H)= 01H (DPTR

19、)= 00FFH (SP)= 51H 9、 ORG 0 LJMP START ；跳转到PC0030H处 ORG 30HSTART： MOV R0,#30H ；#30H>R0 (R0)=30H MOV R1,#20H ； #20H>R1 (R1)=20H MOV A,R0 ；(R0)>A (A)=30H ADD A,#37H ；(A)+#36H>A (A)=67H MOV P1,A ；(A)>P1 (P1)=67H INC R0 ；(R0)+1>R0 (R0)=31H INC R1 ；(R1)+1>R0 (R1)=21H ANL A,R1 ；(A)&am

20、p;(R1)>A (A)=21H SWAP A ；累加器A的上下4位交换 (A)=12H PUSH ACC ；累加器A内容压栈 MOV P1,A ；(A)>P1 (P1)=12H SWAP A ；累加器A的上下4位交换 (A)=21H POP B ；堆栈内容出栈到B存放器 (B)=12H MOV R0,A ；(A)>R0 (R0)=21H MOV DPTR，#2200H ；#2200H>DPTR (DPTR)=2200H SETB C ；1>Cy (Cy)=1 ADDC A,B ；(A)+(B)+(Cy)>A (A)=34H MOVX DPTR,A ；(A)

21、>(DPTR) (2200H)=34H END(R0)= 21H (R1)= 21H (P1)= 12H (B)= 12H (2200H)= 34H 10、 ORG 0 LJMP START ；跳转到(PC)=0030H处 ORG 30H START： MOV SP,#50H ；#50H>SP (SP)=50HMOV R2,#20H ；#20H>R2 (R2)=20H MOV DPTR,#3000H ；#3000H>DPTR (DPTR)=3000H CLR A ；0>A (A)=0 LOOP： MOVX DPTR,A ；(A)>(DPTR) INC DPT

22、R ；(DPTR)+1>DPTR DJNZ R2,LOOP ；(R2)-1>R2 假设(R2)不等于零那么转移到LOOP处 INC DPH ；(DPH)+1>DPH (DPH)=31H (R2)=00H (DPL)=20H INC DPH ；(DPH)+1>DPH (DPH)=32H MOV 20H,#38H ；#36H>(20H) (20H)=38H SETB 01H ；位地址01H置1 20H.1=1 (20H)=3AH MOV A,20H ；(20H)>A (A)=3AH MOVX DPTR,A ；(A)>(DPTR) (DPTR)=3220H

23、(3220H)=3AH INC A ；(A)+1>A (A)=3BH INC A ；(A)+1>A (A)=3CH PUSH ACC ；累加器A内容压栈 XCH A,R2 ；累加器A的内容与R2内容互换 (A)=00H (R2)=3CH POP DPH ；堆栈内容弹到DPH (DPH)=3CH ADD A,#55H ；(A)+#55H>A (A)=55H PUSH ACC ；累加器A内容压栈,(SP)=51H END(A)= 55H (R2)= 3CH (20H)= 3AH (DPTR)= 3C20H (SP)= 51H 11、 ORG 0 LJMP START ；跳转到(P

24、C)=0030H处 ORG 30HSTART： MOV R0,#20H ；#20H>R0 (R0)=20H MOV A,#31H ；#31H>A (A)=31H SETB C ；(Cy)=1 ADDC A,R0 ；(A)+(R0)+Cy>A (A)=52H MOV R0,A ；(A)>(R0) (20H)=52H SWAP A ；累加器A上下4位交换 (A)=25H DEC A ；(A)-1>A (A)=24H MOV DPTR,#2000H ；#2000H>DPTR (DPTR)=2000H INC DPH ；(DPH)+1>DPH (DPH)=21

25、H DEC DPL ；(DPL)-1>DPL (DPL)=0FFH MOV P1,A ；(A)>P1 (P1)=24H INC A ；(A)+1>A (A)=25H MOVX DPTR,A ；(A)>(DPTR) (21FFH)=25H XCH A,R0 ； (A)óR0 (A)=20H (R0)=25H RL A ；累加器A内容循环左移 (A)=40H PUSH ACC ；累加器A的内容入栈 RL A ；累加器A内容循环左移 (A)=80H POP ACC ；堆栈内容弹出到累加器A (A)=40H END(A)= 40H (R0)= 25H (DPTR)=

26、21FFH (P1)= 24H (20H)= 52H 12、 ORG 0 LJMP START ；跳转到(PC)=0030H处 ORG 30H START： MOV SP,#50H ；#50H>SP (SP)=50H MOV DPTR,#2000H ；#3000H>DPTR (DPTR)=2000H MOV 20H,#06H ；#06H>20H (20H)=06H MOV R0,#20H ；#20H>R0 (R0)=20H MOV A,#35H ；#35H>A (A)=35H MOV R2,#10H ；#10H>R2 (R2)=10H SETB 00H ；置

27、位20H.0 (20H.0)=1 (20H)=07H SETB C ；置位Cy (Cy)=1 ADDC A,R0 ；(A)+(R0)+Cy>A (A)=3DH INC R0 ；(R0)+1>R0 (R0)=21H MOV R0,A ；(A)>(R0) (21H)=3DHLOOP： DJNZ R2, LOOP ；(R2)-1>R2 假设R2内容不等于零那么转移 SWAP A ；累加器A内容的上下4位交换 (A)=0D3H PUSH ACC ；累加器A内容入栈 INC DPH ；(DPH)+1>DPH (DPH)=21H MOVX DPTR,A ；(A)>(DP

28、TR) (2100H)=0D3H POP B ；堆栈内容弹出到B (B)=0D3H RR A ；累加器A内容循环右移 (A)=0E9H ADD A,B ；(A)+(B)>A (A)=0BCH MOV P1,A ；(A)>P1 (P1)=0BCH END(21H)= 3DH (R2)= 00H (A)= 0BCH (B)= 0D3H (2100H)= 0D3H 13、 ORG 0 LJMP START ；跳转到PC0030H处 ORG 30H START： MOV DPTR,#2000H ；#2000H>DPTR (DPTR)=2000H MOV A,#36H ；#36H>

29、;A (A)=36H MOV R0,#30H ；#30H>R0 (R0)=30H SETB C ；1>Cy (Cy)=1 MOV R0,A ；(A)>(R0) (30H)=36H RLC A ；累加器A的内容带进位循环左移 (A)=6DH XCH A,R0 ；累加器A的内容与20H单元的内容互换 (A)=36H (30H)=6DH PUSH ACC ；累加器A的内容入栈 POP DPL ；堆栈内容弹出到DPL (DPL)=36H MOVX DPTR,A ；(A)>(DPTR) (2036H)=36H DEC A ；(A)1>A (A)=35H PUSH DPH ；

30、DPH内容压栈 POP B ；堆栈内容弹出到B (B)=20H ADD A,B ；(A)+(B)>A (A)=55H MOV P1,A ；(A)>P1 (P1)=55H CLR A ；累加器A内容清零 ADD A,B ；(A)+(B)>A (A)=20H END(P1)= 55H (B)= 20H (30H)= 6DH (DPTR)= 2036H (R0)= 30H 14、 ORG 0 LJMP START ；跳转到PC0030H处 ORG 30H START： MOV SP,#60H ；#60H>SP (SP)=60H MOV R0,#20H ；#20H>R0

31、(R0)=20H MOV R2,#10H ；#10H>R2 (R2)=10H MOV A,#24H ；#24H>A (A)=24H LOOP： MOV R0,A ；(A)>(R0) INC R0 ；(R0)+1>R0 DJNZ R2,LOOP ；(R2)-1>R2 假设R2内容不等于0那么跳转到LOOP处 SETB 01H ；1>位地址为01H的位 (20H.1)=1 (20H)=26H SETB C ；1>Cy (Cy)=1 ADDC A,20H ；(A)+(20H)+(Cy)>A (A)=4BH SWAP A ；累加器A内容上下四位互换 (A

32、)=0B4H PUSH ACC ；累加器A内容压栈 POP DPH ；堆栈内容弹出到DPH (DPH)=0B4H PUSH ACC ；累加器A内容压栈 POP B ；堆栈内容弹出到B (B)=0B4H MOV A,R2 ；(R2)>A (A)=00H MOV DPL,A ；(A)>DPL (DPL)=00H ADD A,B ；(A)+(B)>A (A)=0B4H PUSH ACC ；累加器A内容压栈 (SP)=61H END(A)= 0B4H (R0)= 30H (20H)= 26H (DPTR)= 0B400H (SP)= 61H 15、 ORG 0 LJMP START ；跳转到PC0030H处 ORG 30HSTART： MOV DPTR,#1100H ；#1100H>DPTR (DPTR)=1100H CLR A ；0>A (A)=00H MOV R1,#20H ；#20H>R1 (R1)=20H SETB C ；1>Cy (Cy)=1 ADDC A,R1 ；(A)+(R1)+Cy>A (A)=21H MOV R1,A ；(A)>(R1) (20H)=21H INC A ；(A)+1>A (A)=22H INC A