单片机扩展8259中断控制器的研究

Research on SCM Extension 8259 Interrupt Controller

针对 8 2 5 9中断控制器工作于 MCS- 80 / 85方式 ,从其工作过程及中断应答时序入手 ,介绍了 82 5 9与89C5 1单片机的硬件接口 ,设计了相应的初始化程序及中断服务程序 ,提出了三级中断嵌套的方法 。

As 8259 interrupt controller is working under MCS 80/85 mode, based on its working process and interrupt response time sequence, this article introduces hardware interface of 8259 and 89C51 SCM and also designs relevant initialization and interrupt service program, as well propose the method of 3rd level interrupt nesting, with which can solve problems and caused by various external interrupt source in SCM application system.