微機原理與接口技術-8086cpu小鍵盤課程設計-閱讀頁
2025-01-31 15:31本頁面
【正文】 OUT DX,AL ；初始化 T1: MOV DX,0640H ；行開放 MOV AL,00H OUT DX,AL JXSR: MOV DX,0644H IN AL,DX AND AL,0FH CMP AL,0FH JE JXSR CALL DELAY ；防抖動 MOV BL,AL ；保存列值 MOV AL,0FEH ；逐行掃描 MOV AH,AL LOP1:MOV DX,0640H OUT DX,AL MOV DX,0644H IN AL,DX AND AL,0FH CMP AL,0FH JNE ZJSC ROL AH,1 MOV AL,AH JMP LOP1 ZJSC:SHL BL,4 AND AH,0FH OR BL,AH ；形成鍵特征值 JNP AAA ；防重鍵 LEA SI,JZTABLE MOV CL,0 LOP3:CMP BL,[SI] JE LOP2 INC CL INC SI JMP LOP3 LOP2:MOV DX,0640H MOV AL,00H OUT DX,AL LOP4: MOV DX,0644H IN AL,DX AND AL,0FH CMP AL,0FH JNE LOP4 CALL DELAY LEA DI,DZTABLE MOV BX,DI MOV AL,CL XLAT MOV DX,0642H OUT DX,AL MOV DX,0640H MOV AL,00H OUT DX,ALAAA JMP T1MOV DX,0640H MOV AL,00H OUT DX,AL MOV AH,4CH INT 21H DELAY PROC NEAR
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