单片机读程序题题库答案

1、 ORG 0

LJMP START ；跳转到〔PC〕＝0030H处 ORG 30H

START：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 ；(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 END

(R0)= 01H (R1)= 31H (P1)= 01H (B)= 01H (2200H)= 02H

第 1 页

2、 ORG 0

LJMP START ；跳转到(PC)=0030H处 ORG 30H

START：MOV SP,#50H ；#50H－>SP (SP)=50H

MOV R2,#10H ；#10H－>R2 (R2)=10H

MOV DPTR,#3000H (DPTR)=3000H

CRL A ；0－>A (A)=0 LOOP： MOVX @DPTR,A ；(A)－>(DPTR)

INC DPTR ；(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)=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－>A (A)=38H INC A ；(A)+1－>A (A)=39H

PUSH ACC ；累加器A内容压栈 (SP)=51H

第 2 页

；

#3000H

－

>DPTR

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 30H

START：MOV R0,#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)=35H INC A ；(A)+1－>A (A)=36H

MOVX @DPTR,A ；(A)－>(DPTR) (2100H)=36H XCH A,R0 ； (A)R0 (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

第 3 页

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)=21H MOV @R0,A ；(A)－>((R0)) (21H)=26H

LOOP： 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)－>P1 (P1)=93H END

(21H)= 26H (R2)= 00H (A)= 93H (B)= 62H (3100H)= 62H

5、 ORG 0

LJMP START ；跳转到〔PC〕＝0030H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 (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

第 4 页

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)+(B)－>A (A)=10H END

(P1)= 22H (B)= 10H (20H)= 27H (DPTR)= 1013H (R0)= 20H 6、 ORG 0

LJMP START ；跳转到〔PC〕＝0030H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

DJNZ 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)=00H

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

第 5 页

(A)= 52H (R2)= 00H (20H)= 25H (DPTR)= 5200H (SP)= 51H 7、 ORG 0

LJMP START ；跳转到〔PC〕＝0030H处 ORG 30H START： MOV DPTR,#2100H ；#2100H－>DPTR (DPTR)=2100H CLR A ；0－>A (A)=00H

MOV R1,#30H ；#30H－>R1 (R1)=30H SETB C ；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 ；(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〔PC〕＝0030H处 ORG 30H

START： MOV SP,#50H ；#50H－>SP (SP)=50H MOV R3,#10H ；#10H－>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

第 6 页

(20H)=01H

SETB C ；1－>Cy (Cy)=1

SUBB A,#00H ；(A)-00H-Cy－>A (A)=0FFH MOV DPL,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)= 00FFH (SP)= 51H

9、 ORG 0

LJMP START ；跳转到〔PC〕＝0030H处 ORG 30H

START： 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)&(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)－>(DPTR) (2200H)=34H END

(R0)= 21H (R1)= 21H (P1)= 12H (B)= 12H (2200H)= 34H 10、 ORG 0

第 7 页

LJMP START ；跳转到(PC)=0030H处 ORG 30H

START： MOV SP,#50H ；#50H－>SP (SP)=50H

MOV 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 DPTR ；(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 (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(PC)=0030H处 ORG 30H

START： 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

第 8 页

DEC A ；(A)-1－>A (A)=24H

MOV DPTR,#2000H ；#2000H－>DPTR (DPTR)=2000H INC DPH ；(DPH)+1－>DPH (DPH)=21H 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)R0 (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)= 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)=3DH

LOOP： 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)－>(DPTR) (2100H)=0D3H

POP B ；堆栈内容弹出到B (B)=0D3H

第 9 页

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〔PC〕＝0030H处 ORG 30H

START： MOV DPTR,#2000H ；#2000H－>DPTR (DPTR)=2000H

MOV A,#36H ；#36H－>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 ；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〔PC〕＝0030H处 ORG 30H

START： MOV SP,#60H ；#60H－>SP (SP)=60H MOV R0,#20H ；#20H－>R0 (R0)=20H MOV R2,#10H ；#10H－>R2 (R2)=10H

第 10 页

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)=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〔PC〕＝0030H处 ORG 30H START： 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 ；(A)+1－>A (A)=23H PUSH ACC ；累加器A的内容压栈

POP DPL ；堆栈内容弹出到DPL (DPL)=23H RR A ；累加器A的内容循环右移 (A)=91H MOV R0,A ；(A)－>R0 (R0)=91H

ORL A,#24H ；(A) or #24H－>A (A)=0B5H MOV P1,A ；(A)－>P1 (P1)=0B5H

第 11 页

SWAP A ；累加器A的内容上下四位交换 (A)=5BH

MOV DPH,A ；(A)－>DPH (DPH)=5BH MOV B,#02H ；#02H－>B (B)=02H ADD A,B ；(A)+(B)－>A (A)=5DH CLR ACC.4 ；0－>ACC.4 (A)=4DH

SWAP A ；累加器A的内容上下四位交换 (A)=0D4H

END

(A)= D4H (R0)= 91H (DPTR)= 5B23H (P1)= 0B5H (20H)= 21H

16、 ORG 0

LJMP START ；跳转到〔PC〕＝0030H处 ORG 30H

START： MOV SP,#60H ；#60H－>SP (SP)=60H MOV R3,#20H ；#20H－>R3 (R3)=20H MOV A,#20H ；#20H－>A (A)=20H MOV R0,#20H ；#20H－>R0 (R0)=20H LOOP： MOV @R0,A ；(A)－>((R0)) INC R0 ；(R0)+1－>R0

DJNZ R3,LOOP ；(R3)-1－>R3 假设R3不等于零那么跳转到LOOP处

SETB 02H ；1－>位地址02H位 (20H.2)=1 (20H)=24H

SETB C ；1－>Cy (Cy)=1

SUBB A,20H ；(A)-(20H)-Cy－>A (A)=0FBH MOV DPL,A ；(A)－>DPL (DPL)=0FBH 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)=0FBH

MOVX @DPTR,A ；(A)－>(DPTR) (00FBH)=0FBH

ANL A,#55H ；(A) and 55H－>A (A)=51H PUSH ACC ；累加器A的内容压栈 (SP)=61H SWAP A ；累加器A内容上下4位交换 (A)=15H

END

(A)= 15H (R3)= 00H (20H)= 24H (DPTR)= 00FBH (SP)= 61H

第 12 页

17、 ORG 0 MOV R2,#8 ;#8->R2 (R2)=8H

MOV R0,#30H ;#30H->R0 (R0)=30H

CLR A ; #0->A (A)=0 CPL A ; 累加器A的内容取反，(A)=0FFH LOOP: MOV @R0,A ; 〔A〕-> (R0) (30H)~(37H)=0FFH INC R0 ; (R0)+1->R0 DJNZ R2,LOOP ; (R2)-1 -> R2 , (R2)≠0那么转移到LOOP处 MOV B,R2 ; (R2) ->B (B)=(R2)=0 INC B ; (B)+1 ->B (B)=1

MOV A,R0 ; (R0) ->A (A)=(R0)=38H CLR C ; 0 -> Cy Cy=0

ADDC A,B ; (A)+(B)+Cy -> A (A)=39H MOV R0,A ; (A) ->R0 (R0)=(A)=39H

RLC A ; 累加器A的内容带进位左移，(A)=72H

MOV DPTR,#1234H ; #1234H ->DPTR (DPTR)=1234H

MOVX @DPTR,A ; (A) ->(DPTR) (1234H)=72H

SWAP A ;累加器A的内容上下4位交换，〔A〕=27H PUSH ACC ; 累加器内容入栈

POP DPH ; 堆栈内容弹出到DPH 〔DPH〕=27H

END

(R0)= 39H (A)= 27H

(33H)= 0FFH (DPTR)= 2734H (1234H)= 72H

评分方法：指令注释占5分，对于程序段注释局部写对的学生可酌情给1－4分；程序段执行结果每空1分，共5分。 18、 ORG 0

MOV SP,#60H ; #60H ->SP (SP)=60H

MOV DPTR,#1000H ; #1000H ->DPTR (DPTR)=1000H MOV R0,#40H ; #40H ->R0 (R0)=40H MOV A,#40H ; #40H ->A (A)=40H MOV R2,#8 ; #8 ->R2 (R2)=08H

LOOP: MOV @R0,A ; (A) ->(R0) (40H)~(47H)=40H INC R0 ; (R0)+1 ->R0

DJNZ R2,LOOP ; (R2)-1 ->R2 , (R2)≠0那么转移到LOOP处 MOV R0,#40H ; #40H ->R0 (R0)=40H MOV R2,#8 ; #8 ->R2 (R2)=08H LOOP1: MOV A,@R0 ; ((R0))->A INC A ; (A)+1 ->A

ANL A,#0FH ; (A) and #0FH ->A

MOVX @DPTR,A ; (A) ->(DPTR) (1000H)~(1007H)=01H

第 13 页

INC R0 ; (R0)+1 ->R0

INC DPTR ; (DPTR)+1 ->DPTR

DJNZ R2,LOOP1 ; (R2)-1 ->R2 , (R2)≠0;那么转移到LOOP1处

PUSH DPL ; DPL内容入栈 (SP)=61H

POP B ; 堆栈内容弹出到B存放器, 〔B〕=08H, (SP)=60H

PUSH DPH ; DPH内容压栈 (SP)=61H

POP ACC ; 堆栈内容弹出到累加器A ,〔A〕＝10H,(SP)=60H

ADD A,B ; (A)+(B) ->A (A)=18H

PUSH B ;存放器B内容压栈 (SP)=61H END

(A)= 18H (B)= 08H

(42H)= 40H (1004H)= 01H (SP)= 61H

评分方法：指令注释占5分，对于程序段注释局部写对的学生可酌情给1－4分；程序段执行结果每空1分，共5分。 19、 ORG 0

MOV R0,#20H ; #20H->R0 (R0)=20H MOV A,#40H ; #40H->A (A)=40H SETB C ; 1->Cy Cy=1

ADDC A,R0 ; (A)+(R0)+Cy->A (A)=61H MOV R2,#8 ; #8->R2 (R2)=08H

LOOP: MOV @R0,A ; (A)->(R0) (20H)~(27H)=61H INC R0 ; (R0)+1->R0

DJNZ R2,LOOP ; (R2)-1->R2 (R2)≠0 那么跳转到LOOP处

MOV P1,R2 ; (R2)->P1 (P1)=0

CLR 00H ; 0->20H.0 (20H)=60H MOV A,20H ; (20H)->A (A)=60H PUSH ACC ; 累加器A的内容入栈

POP DPH ; 弹栈到DPH (DPH)=60H MOV A,25H ; (25H)->A (A)＝61H MOV DPL,A ; (A)->DPL (DPL)=61H END

(20H)= 60H (22H)= 61H

(DPTR)= 6061H (P1)= 00H (R0)= 28H

评分方法：指令注释占5分，对于程序段注释局部写对的学生可酌情给1－4分；程序段执行结果每空1分，共5分。 20、 ORG 0

第 14 页

MOV SP,#50H ; #50H->SP (SP)=50H MOV R0,#20H ; #20H->R0 (R0)=20H MOV B,R0 ; (R0)->B (B)=20H MOV A,#30H ; #30H->A (A)=30H ADD A,B ; (A)+(B)->A (A)=50H SETB C ; 1->Cy Cy=1

RRC A ; 累加器A的内容带进位循环右移 (A)=0A8H Cy=0

MOV @R0,A ; (A)->(R0) (20H)=0A8H SETB 00H ; 1->20H.0 (20H)=0A9H

MOV MOVX INC (DPTR)=1001H

MOV MOVX SWAP (A)=9AH

ORL PUSH POP (SP)=50H

PUSH END

DPTR,#1000H ; #1000H->DPTR (DPTR)=1000H @DPTR,A ; (A)->(DPTR) (1000H)=0A8H

DPL ; (DPL)+1->DPL (DPL)=01H A,@R0 ; ((R0))->A (A)=0A9H

@DPTR,A ; (A)->(DPTR) (1001H)=0A9H

A ; 累加器A的内容进展上下四位交换 A,#0FH ; (A) or #0FH->A (A)=9FH

ACC ; 累加器A的内容入栈 (SP)=51H

DPL ; 弹栈到DPL (DPL)=9FH (DPTR)=109FH ACC ; 累加器A的内容入栈 (SP)=51H 第 15 页