《单片机》读程序题题库答案

1、四、阅读下列程序，注释并填写指令执行后的结果(每题 10 分)1、 ORG 0LJMP START;跳转到(PC)= 0030H 处ORG 30HSTART MOV R0,#20H;# 20H- R0 (R0)=20HMOV R1,#30H;#30H -R1 (R1)=30HMOV A,R0;(R0) - A (A)=20HADD A,#36H;(A)+#36H - A (A)=56HMOV P1,A;(A) - P1(P1)=56HINC R0;(R0)+1 - R0 (R0)=21HINC R1;(R1)+1 - R0 (R1)=31HANL A,R1;(A)&(R1) - A (

2、A)=10HSWAP A;累加器 A 的高低 4 位交换(A)=01HPUSH ACC;累加器 A 内容压栈MOV P1,A;(A) - P1(P1)=01HPOP B;堆栈内容出栈到 B 寄存器(B)=01HMOV R0,A;(A) - R0 (R0)=01HMOV DPTR，# 2200H ; #2200H- DPTR (DPTR)=2200HSETB C;1 - Cy (Cy)=1ADDC A,# 0;(A)+0+(Cy) - A (A)=02HMOVX DPTR,A;(A) - (DPTR) (2200H)=02HEND(R0)= 01H(R1)= 31H(P1)= 01H(B)= 0

3、1H(2200H)= 02HORG 0LJMP START;跳转到(PC)=0030H 处ORG 30HSTART : MOV SP,#50H;#50H-SP (SP)=50HMOV R2,#10H;#10H- R2 (R2)=10HMOVDPTR,#3000H;#3000H- DPTR (DPTR)=3000HCRLA;0- A (A)=0LOOP : MOVX DPTR,A;(A) - (DPTR)INCDPTR;(DPTR)+1- DPTRDJNZ R2,L OOP;(R2)-1 - R2 若(R2)不等于零则转移到 LOOP 处INCDPH;(DPH)+1- DPH (DPH)=31H

4、 (R2)=00H (DPL)=10HINCDPH;(DPH)+1- DPH (DPH)=32HMOV 20H,#36H;#36H- (20H) (20H)=36HSETB 00H;位地址 00H 置 1 20H.0=1 (20H)=37HMOV A,20H;(20H) - A (A)=37HMOVX DPTR,A;(A) - (DPTR) (DPTR)=3210H (3210H)=37HINCA;(A)+1 - A (A)=38HINCA;(A)+1 - A (A)=39HPUSH ACC;累加器 A 内容压栈(SP)=51HXCHA,R2;累加器 A 的内容与 R2 内容互换(A)=00H

5、 (R2)=39HPOPDPH;堆栈内容弹到 DPH (DPH)=39HADDA,#55H;(A)+#55H A (A)=55HPUSHACC;累加器 A 内容压栈END(A)= 55H(R2)= 39H(20H)= 37H (DPTR)= 3910H(SP)= 51H3、ORG 0LJMP START;跳转到(PC)=0030H 处ORG 30HSTART MOV R0,#30H; #30H R0 (R0)=30HMOVA,#12H;#12H- A (A)=12HSETBC;(Cy)=1ADDCA,R0;(A)+(R0)+Cy A (A)=43HMOVR0,A;(A) (R0) (30H)=

6、43HSWAPA;累加器 A 高低 4 位交换(A)=34HINCA;(A)+1 A (A)=35HMOVDPTR,#2000H;#2000H- DPTR (DPTR)=2000HINCDPH;(DPH)+1 DPH (DPH)=21HMOVP1,A;(A) P1(P1)=35HINCA;(A)+1 A (A)=36HMOVXDPTR,A;(A) (DPTR) (2100H)=36HXCHA,R0;(A) R0 (A)=30H (R0)=36HRLA;累加器 A 内容循环左移(A)=60HPUSHACC;累加器 A 的内容入栈RLA;累加器 A 内容循环左移(A)=0C0HPOPACC;堆栈内

7、容弹出到累加器A (A)=60HEND(A)= 60H(R0)= 36H(DPTR)= 2100H(P1)= 35H(30H)= 43H4、ORG 0LJMPSTART;跳转到(PC)=0030H 处ORG30HSTART： MOV SP,#50H;#50H- SP (SP)=50HMOVDPTR,#3000H;#3000H- DPTR (DPTR)=3000HMOVR0,#20H;#20H- R0 (R0)=20HMOVA,#23H;#23H- A (A)=23HMOVR2,#0FH;#0FH- R2 (R2)=0FHSETB01H;置位 20H.1 (20H.1)=1SETBC;置位 Cy

8、 (Cy)=1ADDCA,R0;(A)+(R0)+Cy A (A)=26HINC R0;(R0)+1 R0 (R0)=21HMOVR0,A;(A) - (R0) (21H)=26H5、ORG 0LJMPSTART;跳转到(PC = 0030H 处ORG30HSTART : MOV DPTR,#1000H;#1000H- DPTR (DPTR)=1000HMOVA,#13H;#13H- A (A)=13HMOVR0,#20H;#20H- R0(R0)=20HSETBC;1 - Cy (Cy)=1MOVR0,A;(A) - (R0) (20H)=13HRLCA;累加器 A 的内容带进位循环左移(A

9、)=27HXCHA,R0;累加器 A 的内容与 20H 单元的内容互换(A)=13H (20H)=27HPUSHACC;累加器 A 的内容入栈POPDPL;堆栈内容弹出到 DPL (DPL)=13HMOVXDPTR,A;(A) - (DPTR) (1013H)=13HDECA;(A) - 1 - A (A)=12HPUSHDPH;DPH 内容压栈POPB;堆栈内容弹出到 B (B)=10HADDA,B;(A)+(B) - A (A)=22HMOVP1,A;(A) - P1(P1)=22HCLRA;累加器 A 内容清零ADDA,B;(A)+(B) - A (A)=10HEND(P1)= 22H(

10、B)= 10H(20H)= 27H (DPTR)= 1013H(R0)= 20H6、ORG0LJMPSTART;跳转到(PQ= 0030H 处ORG30HSTART :MOV SP,#50H;#50H- SP (SP)=50HMOVR0,#20H;#20H- R0 (R0)=20HMOV R2,#10H;#10H R2 (R2)=10HSWAPA;累加器 A 内容的高低 4 位交换(A)=62HPUSHACC;累加器 A 内容入栈INCDPH；(DPH)+1 - DPH (DPH)=31HMOVXDPTR,A；(A) - (DPTR) (3100H)=62HPOPB;堆栈内容弹出到 B (B)

11、=62HRRA;累加器 A 内容循环右移(A)=31HADDA,B;(A)+(B) - A (A)=93HMOVP1,A;(A) - P1(P1)=93HEND(21H)= 26H(R2)= 00H(A)= 93H(B)= 62H(3100H)= 62HLOOP DJNZ R2, LOOP;(R2)-1 - R2 若 R2 内容不等于零则转移MOVA,#24H;#24H- A (A)=24HLOOP :MOV R0,A；(A) - (R0)INCRO;(R0)+1 - R0DJNZR2,LOOP;(R2)-1 - R2 若 R2 内容不等于 0 则跳转到 LOOP 处SETB00H;1 - 位

12、地址为 00H 的位(20H.0)=1 (20H)=25HSETBC;1 - Cy (Cy)=1ADDCA,#00H;(A)+00H+(Cy) - A (A)=25HSWAPA;累加器 A 内容高低四位互换 (A)=52HPUSHACC;累加器 A 内容压栈POPDPH;堆栈内容弹出到 DPH (DPH)=52HPUSHACC;累加器 A 内容压栈POPB;堆栈内容弹出到 B (B)=52HMOVA,R2；(R2) - A (A)=00HMOVDPL,A;(A) - DPL (DPL)=00HMOVA,B; (B)-A (A)=52HPUSHACC;累加器 A 内容压栈(SP)=51HEND(

13、A)= 52H(R2)= 00H(20H)= 25H(DPTR)= 5200H(SP)= 51H7、ORG0LJMPSTART;跳转到(PC)= 0030H 处ORG30HSTART MOV DPTR,#2100H; #2100H- DPTR (DPTR)=2100HCLRA;0 - A(A)=00HMOVR1,#30H;#30H-R1(R1)=30HSETBC;1 - Cy(Cy)=1ADDCA,R1;(A)+(R1)+Cy - A (A)=31HMOVR1,A;(A) - (R1) (30H)=31HPUSHACC;累加器 A 的内容压栈POPDPL;堆栈内容弹出到 DPL (DPL)=3

14、1HRRA;累加器 A 的内容循环右移(A)=98HMOVR0,A;(A) - R0(R0)=98HORLA,#24H;(A) or 24H- A (A)=0BCHMOVP1,A;(A) - P1 (P1)=0BCHSWAPA;累加器 A 的内容高低四位交换 (A)=0CBHMOVDPH,A;(A) - DPH (DPH)=0CBHMOVB,#02H;#02H- B (B)=02HADDA,B;(A)+(B) - A (A)=0CDHCLRACC.3;0 - ACC.3 (A)=0C5HSWAPA;累加器 A 的内容高低四位交换(A)=5CHEND(A)= 5CH(R0)= 98H(DPTR)

15、= 0CB31H (P1)= 0BCH (30H)= 31H9、ORG0LJMP START;跳转到(PQ = 0030H 处ORG30HSTART MOV R0,#30H;#30H- R0 (R0)=30HMOVR1,#20H;#20H - R1 (R1)=20HMOVA,R0;(RO) - A (A)=30HADDA,#37H;(A)+#36H - A (A)=67HMOVP1,A;(A) - P1(P1)=67HINCRO;(R0)+1 - R0 (R0)=31HINCR1;(R1)+1 - R0 (R1)=21HANLA,R1;(A)&(R1) - A (A)=21HSWAPA

16、;累加器 A 的高低 4 位交换(A)=12HPUSHACC;累加器 A 内容压栈MOVP1,A;(A) - P1(P1)=12HSWAPA;累加器 A 的高低 4 位交换(A)=21HLJMPSTART;跳转到(PC = 0030H 处ORG30HSTART : MOV SP,#50H;#50H- SP (SP)=50HMOVR3,#10H;#10H- R3(R3)=10HCLRA;累加器 A 内容清零(A)=00HMOVR0,#20H;#20H- R0(R0)=20HLOOP : MOV R0,A;(A) - (R0)(20H)=00HINCRO;(R0)+1 - R0 (20H)=01H

17、DJNZR3,LOOP;(R3)-1 - R3 若 R3 不等于零则跳转到 LOOP 处SETBOOH;1 - 位地址 00H 位(20H.0)=1 (20H)=01HSETBC;1 - Cy (Cy)=1SUBBA,#00H;(A)-OOH-Cy - A (A)=0FFHMOVDPL,A;(A) - DPL (DPL)=OFFHPUSHACC;累加器 A 的内容压栈MOVA,R3;(R3) - A (A)=00HMOVDPH,A;(A) - DPH (DPH)=00HPOPACC;堆栈内容弹出到 A (A)=0FFHMOVXDPTR,A;(A) - (DPTR) (OOFFH)=OFFHAN

18、LA,#55H;(A) and 55H - A (A)=55HPUSHACC;累加器 A 的内容压栈(SP)=51HCLRA;累加器 A 内容清零(A)=00HENDORG 0(A)= OOH (R3)= OOH (20H)= 01H (DPTR)= OOFFH (SP)= 51H8、POP B;堆栈内容出栈到 B 寄存器(B)=12HADDC A,R0;(A)+(R0)+Cy - A (A)=52HMOVR0,A;(A) - R0 (R0)=21HMOVDPTR, #2200H; #2200H- DPTR (DPTR)=2200HSETBC;1 - Cy (Cy)=1ADDC A,B;(A)

19、+(B)+(Cy)- A (A)=34HMOVXDPTR,A;(A) - (DPTR) (2200H)=34HENDORG 30H(R0)= 21H(R1)= 21H(P1)= 12H(B)= 12H(2200H)= 34H10、ORG 0LJMPSTART;跳转到(PC)=0030H 处ORG30HSTART :MOV SP,#50H;#50H- SP (SP)=50HMOV R2,#20H;#20H- R2 (R2)=20HMOVDPTR,#3000H;#3000H- DPTR (DPTR)=3000HCLRA;0- A (A)=0LOOP: MOVX DPTR,A;(A) - (DPTR

20、)INCDPTR;(DPTR)+1- DPTRDJNZR2,LOOP;(R2)-1 - R2 若(R2)不等于零则转移到 LOOP 处INCDPH;(DPH)+1 - DPH (DPH)=31H (R2)=00H (DPL)=20HINCDPH;(DPH)+1 - DPH (DPH)=32HMOV20H,#38H;#36H- (20H) (20H)=38HSETB01H;位地址 01H 置 1 20H.仁 1 (20H)=3AHMOVA,20H;(20H) - A (A)=3AHMOVXDPTR,A;(A) - (DPTR) (DPTR)=3220H (3220H)=3AHINCA;(A)+1

21、 - A (A)=3BHINCA;(A)+1 - A (A)=3CHPUSHACC;累加器 A 内容压栈XCHA,R2;累加器 A 的内容与 R2 内容互换(A)=00H (R2)=3CHPOPDPH;堆栈内容弹到 DPH (DPH)=3CHADDA,#55H;(A)+#55H - A (A)=55HPUSHACC;累加器 A 内容压栈,(SP)=51HEND(A)= 55H(R2)= 3CH(20H)=3AH (DPTR)= 3C20H(SP)= 51H11、ORG0;跳转到(PC)=0030H 处LJMP STARTSTART MOV R0,#20H;#20H- R0 (R0)=20HPO

22、P B;堆栈内容出栈到 B 寄存器(B)=12HADDC A,R0;(A)+(R0)+Cy - A (A)=52HSETB CMOV A,#31H;#31H- A (A)=31H;(Cy)=lMOVR0,A;(A) - (R0) (20H)=52HSWAPA;累加器 A 高低 4 位交换(A)=25HDECA;(A)-1 - A (A)=24HMOVDPTR,#2000H;#2000H- DPTR (DPTR)=2000HINCDPH;(DPH)+1- DPH (DPH)=21HDECDPL;(DPL)-1 - DPL (DPL)=0FFHMOVP1,A;(A) - P1(P1)=24HINC

23、A;(A)+1 - A (A)=25HMOVXDPTR,A;(A) - (DPTR) (21FFH)=25HXCHA,R0;(A) R0 (A)=20H (R0)=25HRLA;累加器 A 内容循环左移(A)=40HPUSHACC;累加器 A 的内容入栈RLA;累加器 A 内容循环左移(A)=80HPOPACC;堆栈内容弹出到累加器A (A)=40HEND(A)= 40H(R0)= 25H(DPTR)= 21FFH (P1)= 24H(20H)= 52H12、ORG0LJMPSTART;跳转到(PC)=0030H 处ORG30HSTART： MOV SP,#50H;#50H- SP (SP)=

24、50HMOVDPTR,#2000H;#3000H- DPTR (DPTR)=2000HMOV20H,#06H;#06H-20H (20H)=06HMOVR0,#20H;#20H- R0 (R0)=20HMOVA,#35H;#35H A (A)=35HMOVR2,#10H;#10H- R2 (R2)=10HSETB00H;置位 20H.0 (20H.0)=1 (20H)=07HSETBC;置位 Cy (Cy)=1ADDCA,R0;(A)+(R0)+Cy - A (A)=3DHINCR0;(R0)+1 - R0 (R0)=21HMOVR0,A;(A) - (R0) (21H)=3DHLOOPDJN

25、Z R2, LOOP;(R2)-1 - R2 若 R2 内容不等于零则转移SWAPA;累加器 A 内容的高低 4 位交换(A)=0D3HPUSHACC;累加器 A 内容入栈INCDPH;(DPH)+1 - DPH (DPH)=21HMOVXDPTR,A;(A) - (DPTR) (2100H)=0D3HPOPB;堆栈内容弹出到 B (B)=0D3HRRA;累加器 A 内容循环右移(A)=0E9HADDA,B;(A)+(B) - A (A)=0BCHMOVP1,A;(A) - P1(P1)=0BCHEND(21H)=3DH(R2)= 00H(A)= 0BCH(B)= 0D3H(2100H)= 0

26、D3H14、ORG 0LJMPSTART;跳转到(PQ= 0030H 处ORG30HSTART :MOV SP,#60H;#60H- SP (SP)=60HMOVR0,#20H;#20H- R0 (R0)=20HMOVR2,#10H;#10H- R2 (R2)=10HMOVA,#24H;#24H- A (A)=24HLOOP :MOV R0,A;(A) - (R0)INCR0;(R0)+1 - R0DJNZR2,LOOP;(R2)-1 - R2 若 R2 内容不等于 0 则跳转到 LOOP 处SETB01H;1 - 位地址为 01H 的位(20H.1)=1 (20H)=26HSETBC;1 -

27、 Cy (Cy)=1ADDCA,20H;(A)+(20H)+(Cy) - A (A)=4BHSWAPA;累加器 A 内容高低四位互换 (A)=0B4HPUSHACC;累加器 A 内容压栈POPDPH;堆栈内容弹出到 DPH (DPH)=0B4HPUSHACC;累加器 A 内容压栈POPB;堆栈内容弹出到 B (B)=0B4HLJMP START;跳转到(PC = 0030H 处ORG30HSTART :MOV DPTR,#2000H;#2000H DPTR (DPTR)=2000HMOVA,#36H;#36H- A (A)=36HMOVR0,#30H;#30H- R0(R0)=30HSETB

28、C;1 - Cy (Cy)=1MOVR0,A;(A) - (R0) (30H)=36HRLCA;累加器 A 的内容带进位循环左移(A)=6DHXCHA,R0;累加器 A 的内容与 20H 单元的内容互换 (A)=36H (30H)=6DHPUSH ACC;累加器 A 的内容入栈POPDPL;堆栈内容弹出到 DPL (DPL)=36HMOVXDPTR,A;(A) - (DPTR) (2036H)=36HDECA;(A) - 1 - A (A)=35HPUSHDPH;DPH 内容压栈POPB;堆栈内容弹出到 B (B)=20HADDA,B;(A)+(B) - A (A)=55HMOVP1,A;(A

29、) - P1(P1)=55HCLRA;累加器 A 内容清零ADDA,B;(A)+(B) - A (A)=20HENDORG 0(P1)= 55H(B)= 20H(30H)= 6DH (DPTR)= 2036H(R0)= 30H13、LOOP : MOV R0,A；(A) - (R0)MOVA,R2;(R2) - A (A)=00HMOVDPL,A;(A) - DPL (DPL)=00HADDA,B;(A)+(B) - A (A)=0B4HPUSHACC;累加器 A 内容压栈(SP)=61HEND(A)= 0B4H (R0)= 30H(20H)= 26H (DPTR)= 0B400H(SP)=

30、61H15、ORG 0LJMP START;跳转到(PC = 0030H 处ORG 30HSTART MOV DPTR,#1100H;#1100H DPTR (DPTR)=1100HCLRA;0 - A(A)=00HMOVR1,#20H;#20H-R1(R1)=20HSETBC;1 - Cy(Cy)=1ADDCA,R1;(A)+(R1)+Cy - A (A)=21HMOVR1,A;(A) - (R1) (20H)=21HINCA;(A)+1 - A (A)=22HINCA;(A)+1 - A (A)=23HPUSHACC;累加器 A 的内容压栈POPDPL;堆栈内容弹出到 DPL (DPL)=

31、23HRRA;累加器 A 的内容循环右移(A)=91HMOVR0,A;(A) - R0(R0)=91HORLA,#24H;(A) or #24H- A (A)=0B5HMOVP1,A;(A) - P1 (P1)=0B5HSWAPA;累加器 A 的内容高低四位交换(A)=5BHMOVDPH,A;(A) - DPH (DPH)=5BHMOVB,#02H;#02H- B (B)=02HADDA,B;(A)+(B) - A (A)=5DHCLRACC.4;0 - ACC.4 (A)=4DHSWAPA;累加器 A 的内容高低四位交换(A)=0D4HEND(A)= D4H(R0)= 91H (DPTR)=

32、5B23H(P1)= 0B5H (20H)= 21H16、ORG0LJMPSTART;跳转到(PC=0030H 处ORG30HSTART : MOV SP,#60H;#60H- SP(SP)=60HMOVR3,#20H;#20H- R3(R3)=20HMOVA,#20H;#20H- A(A)=20HMOVR0,#20H;#20H- R0(R0)=20H(33H)= 0FFH (DPTR)= 2734H(1234H)= 72HINCR0;(R0)+1 - R0DJNZR3,LOOP;(R3)-1 - R3 若 R3 不等于零则跳转到 LOOP 处SETB02H；1 - 位地址 02H 位(20H

33、.2)=1 (20H)=24HSETBC；1 - Cy (Cy)=1SUBBA,20H;(A)-(20H)-Cy- A (A)=0FBHMOVDPL,A;(A) - DPL (DPL)=0FBHPUSHACC;累加器 A 的内容压栈MOVA,R3;(R3) - A (A)=00HMOVDPH,A;(A) - DPH (DPH)=00HPOPACC;堆栈内容弹出到 A (A)=0FBHMOVXDPTR,A;(A) - (DPTR) (00FBH)=0FBHANLA,#55H;(A) and 55H - A (A)=51HPUSHACC;累加器 A 的内容压栈(SP)=61HSWAPA;累加器 A

34、 内容高低 4 位交换(A)=15HEND(A)=15H(R3)= 00H(20H)= 24H(DPTR)= 00FBH(SP)= 61H17、ORG0MOVR2,#8;#8-R2(R2)=8HMOVFD,#30H ;#30H-R0 (R0)=30HCLRA; #0-A(A)=0CPLA；累加器 A 的内容取反，(A)=0FFHLOOP: MOVR0,A;(A)- (R0) (30H)(37H)=0FFHINCR0 ; (R0)+1-R0DJNZR2,LOOP ; (R2)-1 - R2 , (R2)半0则转移到 LOOP处MOVB,R2;(R2) -B (B)=(R2)=0INC;(B)+1

35、 -B (B)=1MOVA,R0;(R0) -A (A)=(R0)=38HCLR;0 - Cy Cy=0ADDCA,B;(A)+(B)+Cy - A (A)=39HMOVR0,A;(A) -R0(R0)=(A)=39HRLC累加器 A 的内容带进位左移，(A)=72HMDVX )PTR,A;(A) -(DPTR) (1234H)=72HSWAPA;累加器 A 的内容高低 4 位交换，(A) =27HPUSHACC ;累加器内容入栈POPDPH ;堆栈内容弹出到 DPH ( DPH =27HEND(R0)=39H(A)= 27HMOVDPTR,#1234H ; #1234H -DPTR (DPT

36、R)=1234H18、ORG 0MOVSP,#60H;#60H -SP(SP)=60HMOVDPTR,#1000H ; #1000H -DPTR(DPTR)=1000HMOVR0,#40H;#40H -R0(R0)=40HMOVA,#40H;#40H -A(A)=40HMOVR2,#8;#8 -R2(R2)=08HLOOP: MOV R0,A;(A) -(R0)(40H)(47H)=40HINCR0; (R0)+1 -R0DJNZ R2,LOOP ; (R2)-1 -R2 , (R2)工 0 则转移到 LOOP 处MOV R0,#40H; #40H -R0 (R0)=40HMOV R2,#8;

37、 #8 -R2(R2)=08HLOOP1: MOV A,R0; (R0)-AINC A; (A)+1 -AANL A,#0FH ; (A) and #0FH -AMOVX DPTR,A ; (A) -(DPTR) (1000H)(1007H)=01HINCR0; (R0)+1 -R0INCDPTR;(DPTR)+1 - DPTRDJNZR2,LOOP1；(R2)-1-R2 , (R2)工 0;则转移到 LOOP1 处PUSHDPL;DPL内容入栈(SP)=61HPOPB；堆栈内容弹岀到 B 寄存器，(B)=08H, (SP)=60HPUSHDPH;DPH内容压栈 (SP)=61HPOPACC堆栈内容弹岀到累加器 A ,(A)= =10H,(SP)=60HADDA,B；(A)+(B) -A (A)=18HPUSHB；寄存器 B 内容压栈(SP)=61H