8259A可编程中断控制器实验 单片的

pc机中断控制器8259A的地址为20H、21H。编程时要根据中断类型型号设置中断矢量，8259中断屏蔽寄存器IMR对应位要清零（允许中断），中断服务结束返回前要使用中断结束命令：

MOV AL，20H

OUT 20H,AL

中断结束返回dos时应将IMR对应位置1，以关闭中断。

-8259A programmable interrupt controller chip in the pc test machine interrupt controller 8259A of the address 20H, 21H. Programming model according to the type set interrupt vector interrupt, interrupt mask register IMR 8259 to clear the corresponding bit (to allow interrupt), interrupt service to return before the end of the end of the command is to be used: MOV AL, 20H OUT 20H, AL dos interrupt when the end of Return IMR should correspond to position 1, to close the break.