微機接口課程設(shè)計(電子鐘)-預(yù)覽頁
【正文】 鍵的鍵面值 PORT1 EQU 340H 。開始暫停標志位置 0 MOV COUNT ,0 。C 口輸出 OUT DX,AL MOV DX,20BH 。寫往控制口 OUT DX,AL MOV DX,320H 。ICW2 MOV AL,08H 。裝載中斷向量 MOV ES,AX MOV DI,08H*4 MOV AX,OFFSET INTSR MOV ES:[DI],AX MOV AX,SEG INTSR MOV ES:[DI+2],AX STI 。蜂鳴器低有效，報時 OUT DX,AL JMP NEXT2 NEXT1: CMP MIN,0 JNE NEXT3 CMP SEC,0 JNE NEXT3 MOV DX,20BH MOV AL,00H 。啟停鍵按下 ，調(diào)用啟停程序 JNZ NEXT5 CALL TSTART JMP NEXT6 NEXT5: CMP AL,0BH 。顯示時間 MOV AL,20H 。當前秒個位為 9，加 1 后變 0，十位加 1 CMP AL,9 JE N1 INC AL MOV SEC,AX JMP N6 N1: INC AH MOV AL,0 CMP AH,6 。小時加 1 后與 24 比，相等，則變?yōu)?0 JE N5 MOV HOUR,AX JMP N6 N5: MOV AX,0 MOV HOUR,AX N6: RET ADDONE ENDP SETTIME PROC 。設(shè)置小時的個位 CALL DELAY CMP AL,0CH JZ L3 MOV AH,BYTE PTR[HOUR+1] L4: CMP AX,0204H JGE L1 MOV HOUR,AX L5: CALL SHOW CALL KEYCHECK 。設(shè)置秒的個位 CALL DELAY CMP AL,0CH JZ L11 MOV AH,BYTE PTR[SEC+1] L12: CMP AX,0509H JG L1 MOV SEC,AX L13: CALL SHOW CALL KEYCHECK 。再次確認是否有 鍵按下 IN AL,DX AND AL,0FH CMP AL,0FH JZ EXIT 。判斷按鍵是否已釋放，若無則等待 AND AL,0FH CMP AL,0FH JNZ WAIT1 POP AX JMP EXIT2 EXIT:MOV AL,0CH EXIT2:NOP POP BX RET KEYCHECK ENDP SHOW PROC 。段選輸出數(shù)據(jù) OUT DX,AL MOV DX,PORT2 。段選輸出數(shù)據(jù) OUT DX,AL MOV DX,PORT2 。段選輸出數(shù)據(jù) OUT DX,AL MOV DX,PORT2
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鄂ICP備17016276號-1