【正文】 ；二進(jìn)制數(shù)轉(zhuǎn)換成BCD碼MOV R1, 40H MOV R0, 2AHBCD1: MOV A, R0 ANL A, 0F0H SWAP AMOV R1, A INC R1 MOV A, R0 ANL A, 0FH MOV R1, A INC R1 DEC R0 DJNZ R7, BCD1 RETINTA: PUSH APUSH BPUSH PSWMOV 31H, 08H ；（31H）=08HMOV 29H, 00H ；（29H）=00HLP0: JB , NEXT0 ；，無鍵按下轉(zhuǎn)NEXT0LCALL DELAY1 ；有鍵按下，延時(shí)1msJB , LP0 ；判斷是否松開，否，再判斷LP1: JNB , LP1 ；是，轉(zhuǎn)LP0INC 29H ；，（29H）+1MOV 30H, 1HSJMP LO1NEXT0: JB SCL, L1 ；判斷SCL鍵，無鍵按下轉(zhuǎn)NEXT0LCALL DELAY1 ；有鍵按下，延時(shí)1msJB SCL, NEXT0LD1: JNB SCL, LD1MOV 29H, 0MOV 30H, 1DJNZ 31H, LO1 ； 是，（31H）1SJMP LLLO1: MOV A, 31HCJNE A, 08H, LO2 ；是否時(shí)針十位？否，轉(zhuǎn)LO2MOV A, 29HCJNE A, 03H, LA1 ；十位大于3嗎？否，轉(zhuǎn)LA1MOV 29H, D0H ；是的，清零LA1: MOV 40H, 29H ；（29H）→(40H)SJMP L1 ；轉(zhuǎn)L1LO2: MOV A, 31HCJNE A, 07H, LO3 ；是否時(shí)針個(gè)位？否，轉(zhuǎn)LO3MOV A, 40HCJNE A, 2, A1MOV A, 29HCJNE A, 4, LA2MOV 29H, 0SJMP LA2A1: MOV A, 29H CJNE A, 0AH, LA2 ；是大于9？否，轉(zhuǎn)LA2 MOV 29H, 00H ；（29H）清零LA2: MOV 41H, 29H ；（29H）→(41H)SJMP L1 ；轉(zhuǎn)到L1LO3: MOV A, 31HCJNE A, 06H, LO4 ；是分針十位嗎？否，轉(zhuǎn)LO4MOV A, 29HCJNE A, 06H, LA3 ；大于6？否，轉(zhuǎn)LA3MOV 29H, 00H ；（29H）清零LA3: MOV 42H, 29H ；（29H）→(42H) SJMP L1 ；轉(zhuǎn)L1LO4: MOV A, 29H CJNE A, 0AH, LA4 ；分針個(gè)位大于9？否，轉(zhuǎn)LA4 MOV 29H, 00H ；（29H）清零LA4: MOV 43H, 29H ；（29H）→(43H)L1: MOV A, 31HCJNE A, 04H, LP0 ；（31H）=0返回，否則轉(zhuǎn)LP0LL: MOV A, 40H ANL A, 0FH SWAP AADD A, 41HMOV 32H, AMOV A, 42HANL A, 0FHSWAP AADD A, 43HMOV 33H, APUSH PSWCLR RS0CLR RS1POP PSWPOP PSWPOP BPOP ASETB EX0CLR TR0MOV TH0, 0FFHMOV TL0, 00HSETB TR0SETB ET0MOV R1, 26HMOV R2, 25HMOV R0, 32HLCALL WRITE ；設(shè)置時(shí)間RETIT0_SEV: PUSH A ；LED定時(shí)掃描程序PUSH PSW ；保護(hù)現(xiàn)場SETB RS1 ；RSRS2=11HSETB RS0 ；選擇3組工作寄存器CLR TR0 ；停止T0定時(shí)控制器CLR ET0 ；停止T0中斷ETB EA ；關(guān)中斷MOV R2, 08H ；設(shè)置顯示器位數(shù)MOV R0, 40H ；設(shè)置段碼首地址MOV R1, 80H ；設(shè)置位碼首地址GO_ON: MOV A, R2 ；送顯示位數(shù)到ACJNE A, 31H, NO_FLASH；判斷是否閃爍位？否，轉(zhuǎn)移到NO_FLASHDJNZ 30H, FLASH ；是閃爍位，轉(zhuǎn)移到FLASHNO_FLASH: MOV P2, R1 ；送位碼到P2口MOV P0, R1 ；將段碼送到P0口LCALL DELAY1 ；調(diào)延時(shí)子程序FLASH: INC R0 ；段碼地址+1INC R1 ；位碼地址+1DJNZ R2, GO_ON ；判斷8位都顯示完否；沒完繼續(xù)顯示下位MOV P2, 00H ；8位都顯示完后，關(guān)顯示器MOV TH0, 0ECCH MOV TL0, 78H ；重置T0計(jì)數(shù)初值POP PSWPOP A ；恢復(fù)現(xiàn)場SETB ET0 ；允許T0中斷SETB TR0 ；啟動(dòng)T0開始定時(shí)SETB EA ；開中斷RETI ；中斷返回DELAY1: MOV R3, 02H ；延時(shí)1ms子程序AGAIN: MOV R4, F9H DELAY: DJNZ R3, AGAIN RETINTB: SETB SETB SCLCLR EX0CLR EX1SETB EAPUSH APUSH BPUSH PSWMOV 31H, 04H ；（31H）=04HMOV 29H, 00H ；（29H）=00HLP0B: JB , NEXTB ；，無鍵按下轉(zhuǎn)NEXT0LCALL DELAY1 ；有鍵按下，延遲1msJB , LP0B ；判斷是否松開,否，轉(zhuǎn)LP0LP1B: JNB , LP1B ；判斷是否松開,否，再判斷 INC 29H ；，29H+1MOV 30H, 1H SJMP LO1BNEXTB: JB SCL, L1B ；判斷SCL鍵是否按下，否，轉(zhuǎn)NEXT0LCALL DELAY1 ；有鍵按下，延遲1msJB SCL, NEXTB ；是否松開？否，轉(zhuǎn)LP0LD1B: JNB SCL, LD1BMOV 29H, 0 ；是否松開？否，轉(zhuǎn)LD1，再判斷MOV 30H, 1DJNZ 31H, LO1B ；是，（31H）1SJMP LLBLO1B: MOV A, 30HCJNE A, 04H, LO2BMOV A, 29HCJNE A, 06H, LA1BMOV 29H, 00HLA1B: MOV 44H, 29H ；（29H）→(44H)SJMP L1B LO2B: MOV A, 31HCJNE A, 03H, LO3BMOV A, 29HCJNE A, 0AH, LA2BMOV 29H, 0SJMP LA2BLA2B: MOV 45H, 29H ；（29H）→(45H)SJMP L1BLO3B: MOV A, 31HCJNE A, 02H, LO4B ；是否分針十位？否，轉(zhuǎn)LO4MOV A, 29HCJNE A, 06H, LA3BMOV 29H, 00HLA3B: MOV 46H, 29HSJMP L1BLO4B: MOV A, 29HCJNE A, 0AH, LA4B ；分針個(gè)位大于9？否，轉(zhuǎn)LA4 MOV 29H, 00HLA4B: MOV 47H, 29H ；（29H）→(47H)L1B: MOV A, 31HCJNE A, 00H, LP0B ；31H=0返回，否則轉(zhuǎn)LP0LLB: MOV A, 44HMOV B, 10MUL ABADD A, 45HMOV 35H, AMOV A, 46HMOV