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8259a單級中斷控制器實驗

CODE SEGMENT ASSUME CS:CODE,DS:CODE,ES:CODE ORG 3400H H8: JMP P8259 ZXK EQU 0FFDCH ZWK EQU 0FFDDH LED DB 0C0H,0F9H,0A4H,0B0H,99H,92H,82H,0F8H,80H,90H DB 88H,83H,0C6H,0A1H,86H,8EH,0FFH,0CH,0DEH,0F3H BUF DB ?,?,?,?,?,? Port0 EQU 0FFE0H Port1 EQU 0FFE1H P8259: CLI CALL WP ;初始化顯示“P.” MOV AX,OFFSET INT8259 MOV BX,003CH MOV [BX],AX MOV BX,003EH MOV AX,0000H MOV [BX],AX CALL FOR8259 mov si,0000h STI CON8: CALL DIS JMP CON8 ;------------------------------------ INT8259:cli MOV BX,OFFSET BUF MOV BYTE PTR [BX+SI],07H INC SI CMP SI,0007H JZ X59 XX59: MOV AL,20H MOV DX,Port0 OUT DX,AL mov cx,0050h xxx59: push cx call dis pop cx loop xxx59 pop cx mov cx,3438h push cx STI IRET X59: MOV SI,0000H CALL WP JMP XX59 ;============================== FOR8259:MOV AL,13H MOV DX,Port0 OUT DX,AL MOV AL,08H MOV DX,Port1 OUT DX,AL MOV AL,09H OUT DX,AL MOV AL,7FH ;IRQ7 OUT DX,AL RET ;--------------------------- WP: MOV BUF,11H ;初始化顯示“P.” MOV BUF+1,10H MOV BUF+2,10H MOV BUF+3,10H MOV BUF+4,10H MOV BUF+5,10H RET ;-------------------------------- DIS: MOV CL,20H MOV BX,OFFSET BUF DIS1: MOV AL,[BX] PUSH BX MOV BX,OFFSET LED XLAT POP BX MOV DX,ZXK OUT DX,AL MOV AL,CL MOV DX,ZWK OUT DX,AL PUSH CX MOV CX,0100H DELAY: LOOP $ POP CX CMP CL,01H JZ EXIT INC BX SHR CL,1 JMP DIS1 EXIT: MOV AL,00H MOV DX,ZWK OUT DX,AL RET ;-------------------------- CODE ENDS END H8 請專業(yè)人士注釋下萬分感謝！??！: 問提問者：網(wǎng)友 | 2017-09-14

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