单片机编程题基础复习题.doc

.1、设计4*4的行列式键盘，并包含两位数码管，这16个键的键值为015，当某个键按下时，将这个键的键值通过两位数码管显示出来。 ORG 0000H LJMP MAIN ORG 0030HMAIN: MOVDPTR,#TAB MOV30H,#0LOOP:LCALL SCAN LCALL DISPLAY SJMP LOOPDISPLAY:MOVA,30H MOVB,#10 DIV AB MOV40H,A MOV41H,B SETBP3.1 CLR P3.0 MOVA,40H MOVCA,A+DPTR MOVP2,A LCALLD20MS SETBP3.0 CLR P3.1 MOVA,41H MOVCA,A+DPTR MOV P2,A LCALLD20MS RETSCAN:MOV P1,#0FH; ；行线送“0” MOV A,P1 ;；读取列线值 ANL A,#0FH MOV R4,A ;列号信息 CJNE A,#0FH,NEXT1 ;；若列线均为“1”则无键按下 SJMP NEXT3NEXT1:ACALL D20MS ;；有键按下，去除抖动 MOV P1,#0F0H ; ；列线送0 MOV A,P1 ;；读取列线值ANL A,#0F0H MOVR5,A ;行号信息 CJNE A,#0F0H,KCODE; ；若有键按下则键处理NEXT3:CLRF0 ;无键按下，F0为0 RETKCODE:SETBF0 ;；有键按下，F0为1 MOV A,R4 ;；计算列值 CJNEA,#0EH,NEXT4 MOVR4,#0 SJMP NEXT5 NEXT4: CJNE A,#0DH,NEXT6 MOVR4,#1 SJMP NEXT5 NEXT6: CJNE A,#0BH,NEXT7 MOV R4,#2 SJMP NEXT5 NEXT7: MOVR4,#3NEXT5: MOV A,R5;；计算行值 CJNE A,#0E0H,NEXT8 MOV R5,#0 SJMP NEXT11 NEXT8: CJNE A,#0D0H,NEXT10 MOV R5,#1 SJMP NEXT11 NEXT10: CJNE A,#0B0H,NEXT9 MOV R5,#2 SJMP NEXT11NEXT9: MOVR5,#3NEXT11: MOV A,R5 MOV B,#4 MUL AB ADD A,R4 MOV 30H,A ;键值放在30H单元 RET D20MS: MOV R6,#50DL2: MOV R7,#100 DJNZ R7,$ DJNZ R6,DL2 RETTAB:DB 3FH,06H,5BH,4FH,66H,6DH,7DH,07H,7FH,6FH,77H,7CH,39H,5EH,79H,71H END2、设计包含两个按键S1、S2和一位数码管的系统。当S1按下时数码管显示的数增一，当增到9后，按下S1按键数值回到0；当S2按下时数码管显示的数减一，当减到0后，按下S2按键数值回到9。 ORG 0000H LJMP MAIN ORG 0030HMAIN: MOVDPTR,#TAB MOVR5,#0LOOP:LCALLKEY MOVA,R5 MOVC A,A+DPTR MOVP2,A SJMPLOOPKEY:JB P1.0,KEY2 LCALL DELAY JB P1.0,KEY2 JNB P1.0,$ INC R5 CJNER5,#10,NET MOVR5,#0NET:RETKEY2:JB P1.1,NET LCALL DELAY JB P1.1,NET JNB P1.1,$ DECR5 CJNER5,#0FFH,NET MOVR5,#9 RETDELAY: MOV R6,#50DL2: MOV R7,#100 DJNZ R7,$ DJNZ R6,DL2 RETTAB:DB 3FH,06H,5BH,4FH,66H,6DH,7DH,07H,7FH,6FH,77H,7CH,39H,5EH,79H,71H END3、设计60秒倒计时电路，完成程序设计，要求用定时器定时产生1秒的时间。ORG 0000HLJMP MAINORG000BHLJMPT0INTORG 0030HMAIN: MOVDPTR,#TABMOVR5,#59 ;存放秒数MOVR4,#20MOVTMOD,#01HMOVTH0,#3CH ;定时50msMOVTL0,#0B0HSETBEASETBET0SETBTR0LOOP:LCALLDISPLAYSJMPLOOPT0INT:MOVTH0,#3CH ;定时50msMOVTL0,#0B0HDJNZR4,EXTMOVR4,#20DECR5CJNER5,#0FFH,EXTMOVR5,#59 ;存放秒数EXT: RETIDISPLAY: MOVA,R5MOVB,#10DIVABMOV40H,AMOV41H,BSETBP3.1CLRP3.0MOVA,40HMOVCA,A+DPTRMOVP2,ALCALLDELAYSETBP3.0CLRP3.1MOVA,41HMOVCA,A+DPTRMOVP2,ALCALLDELAYRETDELAY: MOV R6,#50DL2: MOV R7,#100DJNZ R7,$DJNZ R6,DL2RETTAB:DB 3FH,06H,5BH,4FH,66H,6DH,7DH,07H,7FH,6FH,77H,7CH,39H,5EH,79H,71H END4、用定时器定时产生周期为1MS,占空比为60%的矩形波。ORG 0000HLJMP MAINORG000BHLJMPT0INTORG 0030HMAIN: MOVR4,#10MOVTMOD,#02HMOVTH0,#156 ;定时100USMOVTL0,#156SETBEASETBET0SETBTR0SJMP$T0INT:DJNZR4,NEXTMOVR4,#10SETBP3.7RETINEXT:CJNER4,#4,EXTCLRP3.7EXT: RETIEND5、完成八盏发光二极管流水点亮的电路及程序设计，每个发光二极管点亮0.5秒。ORG 0000HLJMP MAINORG 0030HMAIN: MOVR4,#0FEHLOOP:MOVP1,R4LCALLDELAYMOVA,R4RLAMOVR4,ASJMPLOOPDELAY: MOVR5,#50DL1: MOV R6,#50DL2: MOV R7,#100DJNZ R7,$DJNZ R6,DL2DJNZR5,DL1RETEND6、用动态显示法完成8位数码管的显示，显示内容为“20100618”。ORG 0000HLJMP MAINORG 0030HMAIN: MOVDPTR,#TABMOV30H,#2MOV31H,#0MOV32H,#1MOV33H,#0MOV34H,#0MOV35H,#6MOV36H,#1MOV37H,#8LOOP:LCALL DISPLAYSJMPLOOPDISPLAY: MOVR0,#30H MOVR2,#0FEHLOP1:MOVP3,R2MOVA,R0MOVCA,A+DPTRMOVP2,ALCALLDELAYINCR0MOVA,R2RLAMOVR2,ACJNER0,#38H,LOP1RETDELAY: MOV R6,#50DL2: MOV R7,#50DJNZ R7,$DJNZ R6,DL2RETTAB:DB 3FH,06H,5BH,4FH,66H,6DH,7DH,07H,7FH,6FH,77H,7CH,39H,5EH,79H,71H END7、简单编程题：1）编程查找内部RAM的30H一50H单元中是否有0FFH这一数。若查找到，则将52H单元置为01H,若未找到，则将51H单元置为00H。FIND:MOVR0,#30HNET2:MOVA,R0CJNEA,#0FFH,NETMOV52H,#01HRETNET:INCR0CJNER0,#51H,NET2MOV51H,#00HRET2）两个字符串分别存放在首地址为42H和52H的内部RAM中，字符串长度放在41H单元，请编程比较两个字符串。若相等，则把数字00H送40H单元，否则把0FFH送40H单元。COMP:MOVR7,41HMOVR0,#42HMOVR1,#52HLOOP:MOVA,R0MOV30H,AMOVA,R1CJNEA,30H,NETINCR0INCR1DJNZR7,LOOPMOV40H,#00HRETNET:MOV40H,#0FFHRET3）在外部RAM首地址为TABLE的数据表中有10个字节数据，请编程将每个字节的最高位无条件地置1。ZHIGA:MOVDPTR,#TABLEMOVR7,#10LOOP:MOVXA,DPTRORLA,#80HMOVX DPTR,AINCDPTRDJNZ R7,LOOPRET4）在内部RAM的41H单元开始存有一组单字节无符号数，数据长度为10，要求找出最小数存入40H单元。 FIND:MOVR0,#42HMOV40H,41H ;40H中存放最小的数LOOP:MOVA,R0CJNEA,40H,NETNET:JNCNET2MOV40H,A ;当A小于40H单元的数时，小的数存入40H中NET2:INCR0CJNER0,#4BH,LOOPRET5） 请编写能完成16位二进制数67D3H减去23F9H运算的程序,计算结果的高8位和低8位分别放在内部数据存储器的30H和31H单元。CAL:MOVA,#