微機(jī)接口課程設(shè)計(jì)(電子鐘)-閱讀頁
2025-06-06 02:30本頁面
【正文】 DP SETTIME PROC 。調(diào)用 KEYCHECK，無鍵按下時(shí)， AL 中值為 0CH CALL DELAY CMP AL,0CH JNZ L2 JMP L1 L2: CMP AL,02H JG L1 。設(shè)置小時(shí)的個(gè)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)置分鐘的個(gè)位 CALL DELAY CMP AL,0CH JZ L7 MOV AH,BYTE PTR[MIN+1] L8: CMP AX,0509H JG L1 MOV MIN,AX L9: CALL SHOW CALL KEYCHECK 。設(shè)置秒的個(gè)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 。判斷有無鍵按下子程序 PUSH BX CALL CLEAR MOV DX,PORT2 IN AL,DX AND AL,0FH CMP AL,0FH JZ EXIT 。再次確認(rèn)是否有 鍵按下 IN AL,DX AND AL,0FH CMP AL,0FH JZ EXIT 。形成一個(gè)字節(jié)的鍵碼信息存入 AL,高 4 位為列信息低 4 位為行信息 LEA SI,KEYCOD LEA DI,KEYVAL MOV CX,12 NEXT11: CMP AL,[SI] JZ FIND INC SI INC DI LOOP NEXT11 JMP EXIT FIND: MOV AL,[DI] 。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 。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 。延時(shí)子程序 PUSH CX MOV CX,1000 LOOP $ POP CX RET DELAY ENDP CLEAR PROC
畢業(yè)設(shè)計(jì)相關(guān)推薦
鄂ICP備17016276號(hào)-1