The paper introduces a kind of in-system programable controller for circular machine based on P89C668HFA,shows the hardware functional block diagram of it and the implement method of ISP.

• 介绍了一种基于P89C668HFA单片机的可在线编程的圆机控制器,给出了该控制器的硬件原理框图和ISP的具体实现方法。