基于51單片機(jī)的精確時(shí)鐘設(shè)計(jì)(存儲(chǔ)版)
【正文】 允許中斷 SETB EX1 ；外部中斷 1 允許中斷 SETB IT0 ；外部中斷 0 為下降沿中斷 SETB IT1 ；外部中斷 1 為下降沿中斷 SETB ET0 ；定時(shí)器 0 允許中斷 SETB ET1 ；定時(shí)器 1 允許中斷 SETB PT1 ；設(shè)置 T1 優(yōu)先級(jí) XIAN: MOV A,70H ；用于掃描，顯示時(shí)間 MOVC A,A+DPTR MOV P0,A MOV A,78H MOVC A,A+DPTR MOV P2,A SETB LCALL DELAY1 CLR MOV A,71H MOVC A,A+DPTR MOV P0,A MOV A,79H MOVC A,A+DPTR MOV P2,A 單片機(jī)課程設(shè)計(jì) 17 SETB LCALL DELAY1 CLR MOV A,72H MOVC A,A+DPTR MOV P0,A MOV A,7AH MOVC A,A+DPTR MOV P2,A SETB LCALL DELAY1 CLR MOV A,73H MOVC A,A+DPTR MOV P0,A MOV A,7BH MOVC A,A+DPTR MOV P2,A SETB LCALL DELAY1 CLR MOV A,74H MOVC A,A+DPTR MOV P0,A MOV A,7CH MOVC A,A+DPTR MOV P2,A SETB LCALL DELAY1 CLR MOV A,75H 單片機(jī)課程設(shè)計(jì) 18 MOVC A,A+DPTR MOV P0,A MOV A,7DH MOVC A,A+DPTR MOV P2,A SETB LCALL DELAY1 CLR MOV A,76H MOVC A,A+DPTR MOV P0,A MOV A,7EH MOVC A,A+DPTR MOV P2,A SETB LCALL DELAY1 CLR MOV A,77H MOVC A,A+DPTR MOV P0,A MOV A,7FH MOVC A,A+DPTR MOV P2,A SETB LCALL DELAY1 CLR CLR LJMP XIAN KAISHI: LCALL DELAY ；開(kāi)始 單片機(jī)課程設(shè)計(jì) 19 CPL TR0 RETI UPDATE : ；時(shí)間更新 MOV TH0,0D8H MOV TL0,0F0H MOV A,70H ADD A,01H MOV 70H,A CJNE A,0AH,EXIT1 MOV 70H,00H MOV A,71H ADD A,01H MOV 71H,A CJNE A,0AH , EXIT1 MOV 71H,00H MOV A,72H ADD A,01H MOV 72H,A CJNE A,0AH , EXIT1 MOV 72H,00H MOV A,73H ADD A,01H MOV 73H,A CJNE A,06H , EXIT1 MOV 73H,00H MOV A,74H ADD A,01H MOV 74H,A 單片機(jī)課程設(shè)計(jì) 20 CJNE A,0AH, EXIT1 MOV 74H,00H MOV A,75H ADD A,01H MOV 75H,A CJNE A,06H,EXIT1 MOV 75H,00H MOV B, 0AH MOV A, 77H MUL AB ADD A, 76H MOV R5, A ZD: SETB LCALL DELAY CLR NOP NOP DJNZ R5,ZD MOV A,76H ADD A,01H MOV 76H,A CJNE A,04H , L1 MOV A,77H CJNE A,02H ,EXIT1 MOV 76H,00H MOV 77H,00H LJMP L2 L1: CJNE A,0AH,EXIT1 MOV 76H,00 MOV A,77H ADD A,01H 單片機(jī)課程設(shè)計(jì) 21 MOV 77H,A LJMP EXIT1 EXIT1:
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鄂ICP備17016276號(hào)-1