微機(jī)實(shí)驗(yàn)思考題-資料下載頁(yè)
2025-03-25 01:56本頁(yè)面
【正文】 名同上 PUSH ES MOV AX,0 MOV ES,AX MOV DI,20H LEA AX,MIR7 STOSW MOV AX,CS STOSW POP ES RET WriIntver ENDP MIR7: STI 。允許響應(yīng)INTR可屏蔽型中斷AA2: MOV DX, 0270H ；？？？？？？？？？？？？？？ IN AL, DX MOV DX, 0271H OUT DX, AL MOV AL, 20H MOV DX,IO8259_0 OUT DX, AL 。中斷結(jié)束命令 IRET END START硬件四 8254定時(shí)/計(jì)數(shù)器應(yīng)用實(shí)驗(yàn)1：將CLK0接到時(shí)鐘源，使程序每隔一秒顯示一次M。2: 編寫程序使8254計(jì)數(shù)器0工作于方式0，OUT0接到發(fā)光二極管，使其閃動(dòng)。（x86文檔）8253還有其它五種工作方式，其它工作模式下，硬件如何設(shè)計(jì)？程序如何編寫？1，8253端口0工作在方式0(程序正確性有疑問(wèn))？？？？？？？？？？？？？？ .MODEL TINY COM_ADDR EQU 0263H T0_ADDR EQU 0260H T1_ADDR EQU 0261H .STACK 100 .CODE START: MOV DX,COM_ADDR MOV AL,31H OUT DX,AL 。計(jì)數(shù)器T0設(shè)置在模式0狀態(tài),BCD碼計(jì)數(shù)31H 50H 83H MOV DX,T0_ADDR MOV AL,50H OUT DX,AL MOV AL,83H OUT DX,AL JMP $ END START2，8253端口0工作在方式1（1953）.MODEL TINY COM_ADDR EQU 0263H T0_ADDR EQU 0260H T1_ADDR EQU 0261H .STACK 100 .CODE START: MOV DX,COM_ADDR MOV AL,33H OUT DX,AL 。計(jì)數(shù)器T0設(shè)置在模式1狀態(tài),BCD碼計(jì)數(shù)33H 06H 39H MOV DX,T0_ADDR MOV AL,06H OUT DX,AL MOV AL,39H OUT DX,AL JMP $ END START 3，8253的T0工作方式2（1953）（輸出一個(gè)負(fù)脈沖）.MODEL TINY COM_ADDR EQU 0263H T0_ADDR EQU 0260H T1_ADDR EQU 0261H .STACK 100 .CODE START: MOV DX,COM_ADDR MOV AL,35H OUT DX,AL 。計(jì)數(shù)器T0設(shè)置在模式2狀態(tài),BCD碼計(jì)數(shù)35H 53H 19H MOV DX,T0_ADDR MOV AL,53H OUT DX,AL MOV AL,19H OUT DX,AL JMP $ END START 4，8253的T0工作方式3（1953） .MODEL TINY COM_ADDR EQU 0263H T0_ADDR EQU 0260H T1_ADDR EQU 0261H .STACK 100 .CODE START: MOV DX,COM_ADDR MOV AL,37H OUT DX,AL 。計(jì)數(shù)器T0設(shè)置在模式3狀態(tài),BCD碼計(jì)數(shù)。（clk0接1953產(chǎn)生1HZ方波）37H 53H 19H MOV DX,T0_ADDR MOV AL,53H OUT DX,AL MOV AL,19H OUT DX,AL JMP $ END START 8253的T0工作方式4（1953）.MODEL TINY COM_ADDR EQU 0263H T0_ADDR EQU 0260H T1_ADDR EQU 0261H .STACK 100 .CODE START: MOV DX,COM_ADDR MOV AL,39H OUT DX,AL 。計(jì)數(shù)器T0設(shè)置在模式4狀態(tài),BCD碼計(jì)數(shù) 39H 53H 19H MOV DX,T0_ADDR MOV AL,53H OUT DX,AL MOV AL,19H OUT DX,AL JMP $ END START 8253的T0工作方式5（1953）.MODEL TINY COM_ADDR EQU 0263H T0_ADDR EQU 0260H T1_ADDR EQU 0261H .STACK 100 .CODE START: MOV DX,COM_ADDR MOV AL,3BH OUT DX,AL 。計(jì)數(shù)器T0設(shè)置在模式5狀態(tài),BCD碼計(jì)數(shù) 3BH 53H 19H MOV DX,T0_ADDR MOV AL,53H OUT DX,AL MOV AL,19H OUT DX,AL JMP $ END START 使用8253，編寫一個(gè)實(shí)時(shí)鐘程序。（星研文檔已經(jīng)確認(rèn)正確） .MODEL TINY .STACK 100 .CODE START: MOV DX,0263H MOV AL,37H OUT DX,AL MOV DX,0260H MOV AL,53H OUT DX,AL MOV AL,19H OUT DX,AL MOV DX,0263H MOV AL,77H OUT DX,AL MOV DX,0261H MOV AL,60H OUT DX,AL MOV AL,00H OUT DX,AL MOV DX,0263H MOV AL,0B7H OUT DX,AL MOV DX,0262H MOV AL,60H OUT DX,AL MOV AL,00H OUT DX,AL JMP $ END START
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