最新基于單片機(jī)的秒表設(shè)計(jì)-資料下載頁
2025-06-23 20:32本頁面
【正文】 MOV IE, 10000010BML1: LCALL DISP LJMP ML1TIME: MOV TH0,0D8H MOV TL0,0F0H MOV A,20HINC A CLR C CJNE A,99,GO1 。轉(zhuǎn)換BCD MOV 20H,0 MOV 31H,0 MOV A,21H INC A MOV A,21H INC A CJNE A, 3CH, GO2 MOV 21H, 0H MOV 32H, 0 MOV 33H, 0 MOV A, 22H INC A CJNE A, 0AH, GO3 MOV 22H, 00H MOV 34H, 0 AJMP RET0 。退出中斷GO1: MOV 20H, A MOV B,0AH DIV AB MOV 31H,A ；僅顯示毫秒的百位 AJMP RET0GO2: MOV 21H, A MOV B, 0AH DIV AB MOV 33H, A MOV 32H, B AJMP RET0GO3: MOV 22H, A MOV B, 0AH DIV AB MOV 34H, B ；僅顯示分的個(gè)位 AJMP RET0RET0: POP PSW POP ACC RETIDISP: MOV R0, 31H MOV R3, 0FEH MOV A, R3PLAY: MOV P2, A MOV A, @R0 MOV DPTR, DSEG1 MOVC A, @A+DPTR MOV P0, A LCALL DL1 MOV P2, 0FFH MOV A, R3 RL A JNB , LD1 INC R0 MOV R3, A LJMP PLAYLD1: RETDL1: MOV R7,05H 。延時(shí)5*（255*2+2+1）= 2，565usDL: MOV R6, 0FFHDL6: DJNZ R6,$ DJNZ R7,DL RETDSEG1: DB 3FH,06H,5BH,4FH,66H DB 6DH,7DH,07H,7FH,6FH附2 系統(tǒng)原理圖 22
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