【正文】 ,0FH MOV FENSHI ,A MOV A , R3 ANL A ,0FH MOV FENGE ,A POP PSW RET TAKE3: PUSH PSW 。時(shí)加1子程序 SETB RS1 CLR RS0 MOV A ,SHISHI SWAP A MOV R2 ,A MOV A ,SHIGE ORL A ,R2 ADD A ,01H DA A MOV R2 ,A SWAP A ANL A ,0FH MOV SHISHI ,A MOV A ,R2 ANL A ,0FH MOV SHIGE ,A POP PSW RET TAKE5: PUSH PSW 。秒減1程序 SETB RS1 CLR RS1 MOV A ,SECSHI SWAP A MOV R4 ,A MOV A ,SECGE ORL A ,R4 SUBB A ,01H MOV R4 ,A SWAP A ANL A ,0FH CJNE A ,0FH ,LOPM 。秒到00嗎？ MOV A ,05H LOPM: MOV SECSHI ,A MOV A ,R4 ANL A ,0FH CJNE A ,0FH ,LODP 。個(gè)位是0嗎？ SUBB A, 6 LODP: MOV SECGE ,A POP PSW RET TAKE6: PUSH PSW 。分減1程序 SETB RS1 CLR RS1 MOV A ,FENSHI SWAP A MOV R3 ,A MOV A ,FENGE ORL A ,R3 SUBB A ,01H MOV R3 ,A SWAP A ANL A ,0FH CJNE A ,0FH , LOPF 。分到00嗎？ MOV A ,05H LOPF: MOV FENSHI ,A MOV A ,R3 ANL A ,0FH CJNE A ,0FH ,LODP1 。個(gè)位是0嗎？ SUBB A ,6 LODP1: MOV FENGE ,A POP PSW RET TAKE7: PUSH PSW 。時(shí)減1程序 SETB RS1 CLR RS1 MOV A ,SHISHI SWAP A MOV R2 ,A MOV A ,SHIGE ORL A ,R2 SUBB A ,01H MOV R2 ,A SWAP A ANL A ,0FH CJNE A ,0FH , LOPS 。時(shí)到00嗎？ MOV SHISHI ,02H MOV SHIGE ,03H LJMP LODP3 LOPS: MOV SHISHI ,A MOV A ,R2 ANL A ,0FH CJNE A ,0FH ,LODP2 。個(gè)位是0嗎？ SUBB A ,6 LODP2: MOV SHIGE ,A LODP3: POP PSW RET。******************************************************************。中斷服務(wù)程序 TC0: PUSH PSW SETB RS1 CLR RS0 MOV TH0 ,3CH MOV TL0 ,0B0H DJNZ R5 ,TCC MOV R5 ,20 LCALL TAKE1 CJNE R4 ,60H ,TCC 。判60秒是否到 MOV SECGE ,0 MOV SECSHI ,0 LCALL TAKE2 CJNE R3 ,60H,TCC 。判60分是否到 MOV SECGE ,0 MOV SECSHI ,0 MOV FENSHI ,0 MOV FENGE ,0 LCALL TAKE3 CJNE R2 ,24H ,TCC 。判24小時(shí)是否到 MOV SECGE ,00H MOV SECSHI ,00H MOV FENSHI ,00H MOV FENGE ,00H MOV SHIGE ,00H MOV SHISHI ,00H TCC: LCALL TAKE POP PSW RETI END37