單片機課程設(shè)計---簡易數(shù)字秒表的設(shè)計與仿真-其他專業(yè)-預(yù)覽頁
【正文】 ANL A,0F0H SWAP A MOV R0,A RET CLR0:CLR A MOV R0,A DEC R0 MOV R0,A RET LED顯示子程序： ORG 0300H DISP:MOV R0,79H MOV R3,0FEH LD0:MOV A,R3 MOV DPTR,0FF20H MOVX DPTR,A MOV DPTR,SEG MOV A,R0 DIR0:MOVC A,A+DPTR MOV DPTR,0FF21H DIR1:MOVX DPTR,A ACALL DL INC R0 MOV A,R3 JNB ,LD1 RL A MOV R3,A LJMP LD0 LD1:RET 延時子程序： DL:MOV R6,01FH DELAY2:MOV R7,018H DELAY1:DJNZ R7,DELAY1 DJNZ R6,DELAY2 RET 字符’ 0’ ~’ 9‘的七段 LED代碼表： SEG:DB 0C0H,0F9H,0A4H,0B0H DB 99H,92H,82H,0F8H,80H,90H DB 0C0H,0F9H,0A4H,0B0H DB 99H,92H,82H,0F8H,80H,90H END ：
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鄂ICP備17016276號-1