簡易數(shù)字萬用表設計畢業(yè)設計(參考版)
2025-07-04 00:17本頁面
【正文】 DIVD4: MOV A,R0 MOV B,A ADD A,08h MOV R1,A MOV A,00h ORL A,R1 INC R1 ORL A,R1 INC R1 ORL A,R1 INC R1 ORL A,R1 JZ DIVD45 MOV R1,B MOV R2,04hDIVD41: MOV R1,00h INC R1 DJNZ R2,DIVD41 MOV R3,20hDIVD42: MOV R2,08h MOV A,B MOV R0,A ADD A,07h MOV R1,A CLR CDIVD43: MOV A,R1 RLC A MOV R1,A DEC R1 DJNZ R2,DIVD43 MOV A,R0 ADD A,03h MOV R1,A MOV A,R0 ADD A,0Bh MOV R0,A MOV A,R1 SUBB A,R0 MOV R4,A DEC R1 DEC R0 MOV A,R1 SUBB A,R0 MOV R5,A DEC R1 DEC R0 MOV A,R1 SUBB A,R0 MOV R6,A DEC R1 DEC R0 MOV A,R1 SUBB A,R0 MOV R7,A JC DIVD44 MOV A,B MOV R0,A ADD A,03h MOV R1,A MOV A,R4 MOV R1,A DEC R1 MOV A,R5 MOV R1,A DEC R1 MOV A,R6 MOV R1,A DEC R1 MOV A,R7 MOV R1,A MOV A,R0 ADD A,07h MOV R1,A INC R1DIVD44: DJNZ R3,DIVD42 MOV R0,B CLR OV CLR C RETDIVD45: SETB OV CLR C RET end。四字節(jié)無符號數(shù)除法。若結(jié)果超出2個字節(jié)范圍則OV=1。在出口時總是清除C。永遠不會產(chǎn)生進位。用到累加器A,B,PSW,R2~R7。乘積在R2(高位)、RRR5(低位)中。被乘數(shù)在R2(高位)、R3(低位)中，乘數(shù)在R6(高位)、R7(低位)中。寫第四位數(shù)碼管 movx DPTR,A setb C mov ,C clr C mov ,C call DELAY_5ms setb C mov ,C ret 。寫第二位數(shù)碼管 movx DPTR,A setb C mov ,C clr C mov ,C call DELAY_5ms setb C mov ,C inc r1 mov A,r1 。7段數(shù)碼管字符0的abcdefg的值,a在最低位,最高位始終保留為0 DB 06h DB 5Bh DB 4Fh DB 66h DB 6Dh DB 7Dh DB 07h DB 7Fh DB 6Fh DISPLAY: mov DPTR,0fEffh 。 djnz R5,DELAY_5ms1 。設置R7初始計數(shù)值DELAY_5ms3: djnz R7,DELAY_5ms3 。設置R5初始計數(shù)值DELAY_5ms1: mov R6,16h 。連續(xù)進行4次除以10的操作 mov A,33h 。乘以1000 mov r0,30h mov r1,34h mov A,R2 mov r1,A inc r1 mov A,R3 mov r1,A inc r1 mov A,R4 mov r1,A inc r1 mov A,R5 mov r1,A inc r1 mov r1,00h inc r1 mov r1,00h inc r1 mov r1,00h inc r1 mov r1,0FFh call DIVD4 。以下減去102000 mov r5,A mov 37h,A mov A,r4 subb A,8Eh mov r4,A mov 36h,A mov A,r3 subb A,01h mov r3,A mov 35h,A mov A,r2 subb A,00h mov r2,A mov 34h,A mov r0,30h mov r1,38h mov r1,00h inc r1 mov r1,01h inc r1 mov r1,5Eh inc r1 mov r1,0A0h call DIVD4 。以下根據(jù)范圍設置數(shù)值以防溢出 subb A,B jc LARGERA mov A,B subb A,16h jc LESSA ajmp MIDDLEALARGERA: mov A,0B6h ajmp CALCULATEALESSA: mov A,16h ajmp CALCULATEAMIDDLEA: mov A,BCALCULATEA: mov r2,0C3h mov r3,50h mov r6,00h mov r7,A call MULD2 。加96修正 mov r5,A mov A,r4 addc A,00h mov r4,A mov A,r3 addc A,00h mov r3,A
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