《单片机》读程序题题库答案

1、10分)四、阅读下列程序，注释并填写指令执行后的结果（每题第15页共57页;#30H - R1 (R1)=30H;(R0) -A (A)=20H;(A)+#36H A (A)=56H;(A) -P1(P1)=56H;(R0)+1 -R0 (R0)=21H;(R1)+1 -R0 (R1)=31H;(A)&(R1) -A (A)=10H;累加器A的高低4位交换(A)=01H;累加器A内容压栈;(A) -P1 (P1)=01H;堆栈内容出栈到 B寄存器(B)=01H;(A) -R0 (R0)=01H,2 2200H ; #2200H- DPTR (DPTR)=2200H1、 ORG 0 LJMP S

2、TART ORG 30H START MOV R0,#20HMOV R1,#30H MOV A,R0 ADD A,#36H MOV P1,A INC R0 INC R1 ANL A,R1 SWAP A PUSH ACC MOV P1,A POP B MOV R0,A MOV DPTR SETB C ADDC A, # 0 MOVX DPTR,A END (R0)= 01H(R1)= 31H(B)= 01H(2200H)= 02H2、 ORG 0LJMP START ORG 30H START : MOV SP,#50H;跳转到（PQ = 0030H处;2 20H R0 (R0)=20H;1Cy

3、 (Cy)=1;(A)+0+(Cy) -A (A)=02H;(A) - (DPTR) (2200H)=02H(P1)= 01H ;跳转到(PC)=0030H处;#50H SP (SP)=50HMOVDPTR,#3000H;#3000H- DPTR (DPTR)=3000HCRLA;0-A (A)=0LOOP : MOVX DPTR,A;(A) -(DPTR)INCDPTR;(DPTR)+1 -DPTRDJNZR2,LOOP;(R2)-1 -R2若(R2)不等于零则转移到 LOOPINCDPH;(DPH)+1 -DPH (DPH)=31H (R2)=00H (DPL)=10HINCDPH;(DP

4、H)+1 -DPH (DPH)=32HMOV20H,#36H;#36H (20H) (20H)=36HSETB00H;位地址 00H 置 1 20H.0=1 (20H)=37HMOVA,20H;(20H) A (A)=37HMOVXDPTR,A;(A) - (DPTR) (DPTR)=3210H (3210H)=37HINCA;(A)+1 -A (A)=38HINCA;(A)+1 -A (A)=39HPUSHACC;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 (R2)=39HPOPDPH;堆栈内容弹到 DPH (DPH)=39HADDA,#55

5、H;(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)=30HMOV A,#12H;#12HA (A)=12HSETB C;(Cy)=1ADDC A,R0;(A)+(R0)+Cy -A (A)=43HMOV R0,A；(A)-(R0) (30H)=43HMOV R2,#10H;#10H R2 (R2)=10HSWAP A;累加器A高低

6、4位交换(A)=34HINC A;(A)+1 -A (A)=35HMOVDPTR,#2000H;#2000H DPTR (DPTR)=2000HINC DPH;(DPH)+1DPH (DPH)=21HMOV P1,A;(A) -P1 (P1)=35HINC A;(A)+1 -A (A)=36HMOVX DPTR,A;(A) - (DPTR) (2100H)=36HXCH A,R0;(A) R0 (A)=30H (R0)=36HRL A;累加器A内容循环左移(A)=60HPUSH ACC;累加器A的内容入栈RL A;累加器A内容循环左移(A)=0C0HPOP ACC;堆栈内容弹出到累加器A (A

7、)=60HEND(A)= 60H(R0)= 36H (DPTR)=2100H(P1)= 35H(30H)= 43H4、ORG 0LJMP START;跳转到(PC)=0030H处ORG 30HSTART: MOV SP,#50H;#50H SP (SP)=50HMOV DPTR,#3000H;#3000H- DPTR (DPTR)=3000HMOV R0,#20H;#20H R0 (R0)=20HMOV A,#23H;#23H A (A)=23HMOV R2,#0FH;#0FH R2 (R2)=0FHSETB 01H;置位 20H.i (20H.1)=1SETB C;置位 Cy (Cy)=1A

8、DDC A,R0;(A)+(R0)+Cy - A (A)=26HINC R0;(R0)+1 - R0 (R0)=21HMOV R0,A;(A) - (R0) (21H)=26HLOOP DJNZ R2, LOOP;(R2)-1 -R2若R2内容不等于零则转移SWAP A;累加器A内容的高低4位交换(A)=62HPUSH ACC;累加器A内容入栈INC DPH;(DPH)+1-DPH (DPH)=31HMOVX DPTR,A;(A) - (DPTR) (3100H)=62HPOPB;堆栈内容弹出到 B (B)=62HRRA;累加器A内容循环右移(A)=31HADD ,A,B;(A)+(B) -A

9、 (A)=93HMOVP1,A;(A) - P1(P1)=93HEND(21H)= 26H(R2)= 00H(A)=93H(B)= 62H(3100H)= 62H5、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)=27HXCHA,R0;累加器

10、 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)=13HMOVX DPTR,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(B)= 10H(20H)=27H (DPTR)= 1013

11、H(R0)= 20H6、ORG 0LJMPSTART;跳转到(PQ = 0030H处ORG30HSTARTMOV SP,#50H;#50H SP (SP)=50HMOVR0,#20H;#20H R0 (R0)=20HMOVMOVR2,#10HA,#24H;#10H R2 (R2)=10H;#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LOOPSETB00H;1 位地址为 00H 的位 (20H.0)=1 (20H)=25HSETBC;1 Cy (Cy)=1ADDC

12、A,#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(A)= 52H(R2)= 00H(20H)= 25H(DPTR)= 5200H(SP)= 51H7、ORG0LJMPSTART;跳

13、转到(PC = 0030H处ORG30HSTART MOVDPTR,#2100H; #2100H- DPTR (DPTR)=2100HCLRA;0- A (A)=00HMOVR1,#30H;#30H R1 (R1)=30HSETBC;1Cy (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)=31HRRA;累加器A的内容循环右移(A)=98HMOVR0,A;(A) R0 (R0)=98HORLA,#24H;(A) or 24H -A (A

14、)=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)=0CB31H (P1)= 0BCH (30H)= 31H8、ORG 0LJMP START;跳转到(PC) = 0030H处ORG 30HSTART : MOV

15、SP,#50H;#50HSP (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)=00HINCR0;(R0)+1R0 (20H)=01HDJNZR3,LOOP;(R3)-1 -R3若R3不等于零则跳转到 LOO既SETB00H;1 位地址 00H位(20H.0)=1 (20H)=01HSETBC;1Cy (Cy)=1SUBBA,#00H;(A)-00H-Cy -A (A)=0FFHMOVDPL,A;(A) DPL (DPL

16、)=0FFHPUSHACC;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) (00FFH)=0FFHANLA,#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)=00HEND(A)= 00H(R3)= 00H(20H)= 01H (DPTR)= 00FFH (SP)= 51HLJMPORGSTART30H;跳转到(PC) = 0030H处START M

17、OV R0,#30H;#30HR0 (R0)=30HMOVR1,#20H;#20H - R1 (R1)=20HMOVA,R0;(R0) A (A)=30HADDA,#37H;(A)+#36H A (A)=67HMOVP1,A;(A) -P1(P1)=67HINCR0;(R0)+1 -R0 (R0)=31HINCR1;(R1)+1 -R0 (R1)=21HANLA,R1;(A)&(R1) - A (A)=21HSWAPA;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)=21HPOPB;

18、堆栈内容出栈到 B寄存器(B)=12HMOVR0,A;(A) - R0 (R0)=21HMOVDPTR,#2200H ; #2200H- DPTR (DPTR)=2200HSETBC;1 Cy (Cy)=1ADDCA,B;(A)+(B)+(Cy) -A (A)=34HMOVXENDDPTR,A;(A) (DPTR) (2200H)=34H9、ORG 0(R0)= 21H(R1)= 21H(P1)= 12H(B)= 12H(2200H)= 34H10、ORG 0LJMPORGSTART30H;跳转到(PC)=0030H处START :MOV SP,#50H;#50H SP (SP)=50HMOV

19、 R2,#20H;#20H R2 (R2)=20HMOVDPTR,#3000H;#3000H- DPTR (DPTR)=3000HCLRA;0-A (A)=0LOOPMOVX DPTR,A;(A) - (DPTR)INCDPTR;(DPTR)+1DPTRDJNZR2,LOOP;(R2)-1 R2若(R2)不等于零则转移到 LOOPINCDPH;(DPH)+1DPH (DPH)=31H (R2)=00H (DPL)=20HINCDPH;(DPH)+1DPH (DPH)=32HMOV20H,#38H;#36H (20H) (20H)=38HSETB01H;位地址 01H置 1 20H.1=1 (2

20、0H)=3AHMOVA,20H;(20H) A (A)=3AHMOVXDPTR,A;(A) (DPTR) (DPTR)=3220H (3220H)=3AHINCA;(A)+1 -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 (

21、SP)= 51H11、 ORG0LJMPSTART;跳转到(PC)=0030H处ORG 30HSTART MOV R0,#20H;#20H R0 (R0)=20HMOVA,#31H;#31HA (A)=31HSETBC;(Cy)=1ADDCA,R0;(A)+(R0)+Cy -A (A)=52HMOVR0,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

22、-DPL (DPL)=0FFHMOVP1,A;(A) -P1 (P1)=24HINCA;(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)=80HPOP ACC;堆栈内容弹出到累加器A (A)=40HEND(A)= 40H(R0)= 25H (DPTR)= 21FFH (P1)= 24H(20H)= 52H12、ORG0LJMPORGSTART30H;跳转到(PC)=003

23、0H处START: MOV SP,#50H;#50H SP (SP)=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)=21HMO

24、VR0,A;(A) - (R0) (21H)=3DHLOOPDJNZ 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)=0BCHMOVENDP1,A;(A) -P1(P1)=0BCH(21H)=3DH(R2)= 00H(A)= 0BCH (B

25、)= 0D3H (2100H)= 0D3H13、 ORG 0LJMP START;跳转到(PC) = 0030H处ORG 30HSTART : MOV DPTR,#2000H; #2000H DPTR (DPTR)=2000HMOV A,#36H; #36H A (A)=36HMOVR0,#30H;#30H R0 (R0)=30HSETBC;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)=6DHPUSHACC;累加器A的内容入栈POPD

26、PL;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) -P1 (P1)=55HCLRA;累加器A内容清零ADDA,B;(A)+(B) A (A)=20HEND(P1)= 55H(B)= 20H(30H)=6DH (DPTR)= 2036H(R0)= 30H14、ORGLJMP；0START;跳转到(PQ = 0030H处ORGSTART30HM

27、OV 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LOOPSETB01H;1 位地址为 01H 的位 (20H.1)=1 (20H)=26HSETBC;1 Cy (Cy)=1ADDCA,20H;(A)+(20H)+(Cy) -A (A)=4BHSWAPA;累加器A内容高低四位互换(A)=0B

28、4HPUSHACC;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）=0B4HMOVA,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)= 61H15、ORG0LJMPSTART;跳转到（P。= 0030H处ORG30HSTART MOV DPTR,#1100H;

29、 #1100H DPTR (DPTR)=1100HCLRA;0- A (A)=00HMOVR1,#20H;#20H R1 (R1)=20HSETBC;1Cy (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）=23HRRA;累加器A的内容循环右移（A）=91HMOVR0,A;(A) - R0 (R0)=91HORLA,#24H;(A) or #24H - A

30、(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)= 5B23H(P1)= 0B5H (20H)= 21HLJMPSTART;跳转到(PC) = 0030H处ORG30HSTART : MOV SP,#60H;#60H SP

31、 (SP)=60HMOVR3,#20H;#20H R3 (R3)=20HMOVA,#20H;#20H A (A)=20HMOVR0,#20H;#20H R0 (R0)=20HLOOP : MOV R0,A;(A) (R0)INCR0;(R0)+1 R0DJNZR3,LOOP;(R3)-1 -R3若R3不等于零则跳转到 LOO既SETB02H;1 位地址 02H位(20H.2)=1 (20H)=24HSETBC;1Cy (Cy)=1SUBBA,20H;(A)-(20H)-Cy - A (A)=0FBHMOVDPL,A;(A) DPL (DPL)=0FBHPUSHACC;累加器A的内容压栈MOVA

32、,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)=8HMOVR0,#30H ;#30H-R0 (R0)=30HCLRA;

33、#0-A(A)=0CPLA;累加器A的内容取反，(A)=0FFHLOOP: MOVR0,A;(A)- (R0) (30H)(37H)=0FFH16、ORG 0INC R0 ; (R0)+1-R0DJNZ R2,LOOP ； (R2)-1 - R2 , (R2)，0 则转移到 LOO也MOVB,R2; (R2) -B (B)=(R2)=0INC B ; (B)+1 -B (B)=1MOV A,R0; (R0) -A (A)=(R0)=38HCLR C; 0 - Cy Cy=0ADDCAB; (A)+(B)+Cy - A (A)=39HMOVR0,A;(A) -R0 (R0)=(A)=39HRLC

34、 A ;累加器A的内容带进位左移，(A)=72HMOVDPTR,#1234H ; #1234H -DPTR (DPTR)=1234HMOVX PTR,A ; (A) -(DPTR) (1234H)=72HSWAP APUSH ACCPOP DPH累加器A的内容高低4位交换，(A) =27H累加器内容入栈堆栈内容弹出到 DPH (DPH =27HEND(R0)= 39H(A)= 27H (33H)= 0FFH (DPTR)= 2734H(1234H)= 72H评分办法：指令注释占 5分，对于程序段注释部分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 0MOV SP

35、,#60H; #60H -SP (SP)=60HMOV DPTR,#1000H ; #1000H -DPTR (DPTR)=1000HMOV R0,#40H; #40H -R0 (R0)=40HMOV A,#40H; #40H -A(A)=40HMOV R2,#8; #8 -R2(R2)=08HLOOP: MOV R0,A; (A) -(R0) (40H)(47H)=40HINC R0 ; (R0)+1 -R0DJNZ R2,LOOP ; (R2)-1 -R2 , (R2)，0 则转移到 LOOP处MOV R0,#40H; #40H -R0 (R0)=40HMOV R2,#8; #8 -R2(

36、R2)=08HLOOP1: MOV A,R0; (R0)-AINC A ; (A)+1 -AANL A,#0FH ; (A) and #0FH -AMOVX DPTR,A ; (A) -(DPTR) (1000H)(1007H)=01HINC R0 ; (R0)+1 -R0DJNZPUSHPOPPUSHPOPADDPUSHENDR2,LOOP1 ; (R2)-1 -R2 , (R2)丰 0;则转移到 LOOP1 处DPL; DPL内容入栈(SP)=61HB;堆栈内容弹出到 B寄存器，(B) =08H, (SP)=60HDPH; DPH内容压栈(SP)=61HACC；堆栈内容弹出到累加器 A ,

37、 (A) = 10H,(SP)=60HA,B; (A)+(B) -A (A)=18HB;寄存器B内容压栈(SP)=61H(A尸18H(B)：=08H(42H)=40H(1004H)= 01H(SP)= 61H评分办法：指令注释占5分，对于程序段注释部分写对的学生可酌情给14分；程序段执行结果每空19、ORG 0MOV R0,#20H; #20H-R0 (R0)=20HMOV A,#40H; #40H-A (A)=40HSETB C; 1-Cy Cy=1ADDC A,R0; (A)+(R0)+Cy-A (A)=61HMOV R2,#8; #8-R2 (R2)=08HLOOP: MOV R0,A;

38、 (A)-(R0) (20H)(27H)=61HINC R0; (R0)+1-R0DJNZ R2,LOOP ; (R2)-1-R2 (R2)，0 则跳转到MOVP1,R2; (R2)-P1 (P1)=0CLR 00H; 0-20H.0 (20H)=60HMOVA,20H; (20H)-A (A)=60HPUSH ACC;累加器A的内容入栈POP DPH;弹栈至U DPH (DPH)=60HMOV A,25H; (25H)-A(A)=61HMOV DPL,A ; (A)-DPL (DPL)=61H ENDLOOP&(20H)=60H(22H)= 61H(DPTR)=6061H(P1)= 00H(

39、R0)= 28HINC1分,评分办法：指令注释占 5分，对于程序段注释部分写对的学生可酌情给1-4分；程序段执行结果每空 1分,DPTR ; (DPTR)+1 -DPTR20、ORG0MOVSP,#50H;#50H-SP (SP)=50HMOVR0,#20H;#20H-R0 (R0)=20HMOVB,R0;(R0)-B(B)=20HMOVA,#30H;#30H-A (A)=30HADDA,B;(A)+(B)-A (A)=50HSETBc;1-Cy Cy=1RRCA;累加器A的内容带进位循环右移(A)=0A8H Cy=0MOVR0,A;(A)-(R0) (20H)=0A8HSETB00H;1-2

40、0H.0 (20H)=0A9HMOVDPTR,#1000H ; #1000H-DPTR (DPTR)=1000HMOVXDPTR,A ; (A)-(DPTR) (1000H)=0A8HINCDPL;(DPL)+1-DPL (DPL)=01H (DPTR)=1001HMOVA,R0;(R0)-A (A)=0A9HMOVXDPTR,A ; (A)-(DPTR) (1001H)=0A9HSWAPA;累加器A的内容进行高低四位交换(A)=9AHORLA,#0FH;(A) or #0FH-A (A)=9FHPUSHACC;累加器A的内容入栈 (SP)=51HPOPDPL ;弹栈至U DPL (DPL)=

41、9FH (DPTR)=109FH (SP)=50HPUSHACC;累加器A的内容入栈 (SP)=51HEND(Cy)= 0(SP)= 51H (DPTR)= 109FH(1000H)= 0A8H(1001H)= 0A9H 评分办法：指令注释占 5分，对于程序段注释部分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21、 ORG 0MOVR0,#30H; #30H-R0 (R0)=30HMOV R2,#8; #8-R2(R2)=8LOOP: MOV A,R2 ; (R2)-A (A)=08HMOV R0,A; (A)-(30H) (30H)(37H)=08H01HINC R0 ;

42、(R0)+1-R0DJNZ R2,LOOP ; (R2)-1-R2若(R2)，0 贝U;跳转到 LOO也MOV A,30H; (30H)-A (A)=08HMOV B,A ; (A)-B(B)=08H第16页共57页MOVA,31H; (31H)-A (A)=07HADD A,B ; (A)+(B)-A (A)=0FHMOVDPTR,#1000H ; #1000H-DPTR (DPTR)=1000HMOVX DPTR,A ; (A)-(DPTR) (1000H)=0FHSWAP A ；累加器A的内容高低四位交换(A)=0F0HDEC DPL ; (DPL)-1-DPL (DPL)=0FFHMO

43、VX DPTR,A ; (A)-(DPTR) (10FFH)=0F0HSETB C ; 1-Cy (Cy)=1RRC A ;累加器A的内容带进位循环右移(A)=0F8HMOV R0,A ; (A)-R0(R0)=0F8HEND(R0)= 0F8H (Cy)= 0 (32H)= 06H (DPTR)= 10FFH (1000H)= 0FH 评分办法：指令注释占5分，对于程序段注释部分写对的学生可酌情给1-4分；程序段执行结果每空1分,分。22、 ORG 0MOVSP,#60H;#60H-SP(SP)=60HMOVR0,#20H;#20H-R0(R0)=20HMOV R2,#8; #8-R2(R2

44、)=08HMOVA,#0EEH; #0EEH-A(A)=0EEHCPL A ;累加器A的内容取反(A)=11HLOOP: MOV R0,A; (A)-(R0) (20H)(27H)=11HINCR0; (R0)+1-R0DJNZR2,LOOP;(R2)-1-R2若(R2) ,0 则跳车t到 LOO也。MOVA,R0;(R0)-A(A)=28HSETBc;1-Cy(Cy)=1ADDCA,21H;(A)+(21H)+Cy-A (A)=3AH (Cy)=0MOVP1,A;(A)-P1(P1)=3AHCLR00H;0-20H.0(20H)=10HMOVA,20H;(20H)-A(A)=10HSWAPA

45、;累加器内容高低四位交换(A)=01HPUSHACC;累加器A的内容入栈(SP)=61HMOVDPH,#10H;#10H-DPH (DPH)=10HPOPDPL;堆栈内容弹出到 DPL (DPL)=01H (DPTR)=1001H (SP)=60HMOVXDPTR,A;(A)-(DPTR) (1001H)=01HPUSH ACC ;累加器A的内容入栈 (SP)=61HEND(Cy)= 0(P1)= 3AH (R2)= 00H (DPTR)= 1001H(SP)= 61H23、 ORG 0MOVR0,#20H; #20H-R0 (R0)=20HMOVR2,#8; #8-R2(R2)=08HMOV

46、A,#0F8H; #0F8H-A (A)=0F8HANL A,#0FH ; (A) and #0FH-A (A)=08HLOOP: MOV R0,A; (A)-(R0) (20H)(27H)=08HINC R0 ; (R0)+1-R0若(R2) w 0则跳转到LOOPDJNZ R2,LOOP ; (R2)-1-R2SETB 00H; 1-20H.0 (20H)=09HMOV A,20H; (20H)-A (A)=09HSWAP A ;累加器A的内容高低四位交换，(A)=90HMOVP1,A; (A)-P1(P1)=90HADDA,21H; (A)+(21H)-A (A)=98HMOVDPTR,

47、#1000H ; #1000H-DPTR (DPTR)=1000HMOVX DPTR,A ; (A)-(DPTR) (1000H)=98HORL A,#0FH ; (A) or #0FH-A (A)=9FHINC DPTR ; (DPTR)+1-DPTR , (DPTR)=1001HMOVX DPTR,A ; (A)-(DPTR)(1001H)=9FHDECDPL; (DPL)-1-DPL (DPL)=00H (DPTR)=1000HDECDPL; (DPL)-1-DPL (DPL)=0FFH (DPTR)=10FFHEND(R2)= 00H(P1)= 90H 24、(DPTR)= 10FFH

48、(1000H)= 98H(1001H)= 9FH MOVSP,#60H;#60H-SP (SP)=60HMOVA,#88H;#88H-A(A)=88HCPLA；累加器A的内容取反 (A)=77HADDA,#1;(A)+1-A(A)=78HORG0RRCA;累加器A的内容带进位循环右移(A)=0BCHMOVDPTR,#2000H ; #2000H-DPTR (DPTR)=2000HMOVXDPTR,A;(A)-(DPTR) (2000H)=0BCHMOV20H,A;(A)-20H (20H)=0BCHSETB00H;1-20H.0 (20H)=0BDHMOVA,20H;(20H)-A (A)=0BDHMOVR0,#0F0H;#0F0H-R0 (R0)=0F0HORLA,R0;(A)