实验三 8259 8253 8255综合实验.doc

实验三 8253、8255、8259综合实验 一．8253计数器实验 要求：计数器1方式0计数，计满3个数产生中断，中断5次后结束。 实验线路： 实验程序： INTPORT1 EQU 0FF80H INTPORT2 EQU 0FF81H INTQ3 EQU INTREEUP3 TCONTR0 EQU 0043H TCON1 EQU 0041H PA EQU 0FF20H ;字位口 PB EQU 0FF21H ;字形口 PC EQU 0FF22H ;键入口 ORG 12D0H START: JMP START0 BUF DB ?,?,?,?,?,? intcnt db ? data1 db 0c0h,0f9h,0a4h,0b0h,99h,92h,82h,0f8h,80h,90h,88h,83h,0c6h db 0a1h,86h,8eh,0ffh,0ch,89h,0deh,0c7h,8ch,0f3h,0bfh,8FH START0: CLD CALL BUF1 CALL WRINTVER ;WRITE INTRRUPT MOV AL,13H MOV DX,INTPORT1 OUT DX,AL MOV AL,08H MOV DX,INTPORT2 OUT DX,AL MOV AL,09H OUT DX,AL MOV AL,0F7H OUT DX,AL MOV intcnt,01H ;TIME=1 MOV DX,TCONTR0 MOV AL,51H OUT DX,AL MOV DX,TCON1 MOV AL,03 OUT DX,AL MOV DX,0FF23H MOV AL,80 OUT DX,AL STI WATING: CALL DISP ;DISP 8259-1 JMP WATING WRINTVER: MOV AX,0H MOV ES,AX MOV DI,002CH LEA AX,INTQ3 STOSW MOV AX,0000h STOSW RET INTREEUP3: push ax push bx push cx push dx MOV DX,TCON1 MOV AL,03 OUT DX,AL MOV AL,INTCNT CALL CONVERS MOV BX,OFFSET BUF MOV AL,10H MOV CX,05H INTRE0: MOV [BX],AL INC BX LOOP INTRE0 ADD INTCNT,01H CMP INTCNT,06H JNA INTRE2 CALL BUF2 ;DISP:good INTRE1: CALL DISP JMP INTRE1 CONVERS: AND AL,0FH MOV BX,offset buf MOV [BX+5],AL RET INTRE2: MOV AL,20H MOV DX,INTPORT1 OUT DX,AL pop dx pop cx pop bx pop ax IRET DISP: MOV AL,0FFH ;00H MOV DX,PA OUT DX,AL MOV CL,0DFH ;20H MOV BX,OFFSET BUF DIS1: MOV DX,PC OUT DX,AL MOV AL,[BX] MOV AH,00H PUSH BX MOV BX,OFFSET DATA1 ADD BX,AX MOV AL,[BX] POP BX MOV DX,PB OUT DX,AL MOV AL,CL MOV DX,PA OUT DX,AL PUSH CX