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Z80ExerciserⅡ单板机的线路图已在本讲座第二讲刊出,从线路图可以看出,单板机具有如下外围电路:计数器/定时器芯片Z8O—CTC(V_(18))、六个七段显示器及其驱动电路、键盘电路。限于篇幅,下面介绍CTC和单板机的应用举例。一、Z80—CTC Z80—CTC是一块具有四个独立计数器/定时器(称四个通道)的芯片。每个通道可用作计数器或定时器,作何用途可由程序选择。因此,Z80—CTC又是一个可编程的组件。当然,可编程的内容不限于选择通道的用途,还包括其它方面。 Z80芯片的内部由四部分组成;1、与CPU总线的接口;2、内部控制逻辑;3、中断控制逻辑;4、4个计数器/定时器。
The circuit diagram of the Z80Exerciser II single board computer has been published in the second part of this lecture. It can be seen from the circuit diagram that the single board computer has the following peripheral circuits: counter / timer chip Z8O-CTC (V_ (18)), Segment display and its driver circuit, keyboard circuit. Due to space limitations, the following describes the CTC and single board machine application examples. A, Z80-CTC Z80-CTC is a chip with four independent counters / timers (called four channels). Each channel can be used as a counter or timer, for what purpose can be selected by the program. Therefore, Z80-CTC is a programmable component. Of course, the programmable content is not limited to the purpose of selecting a channel, but also includes other aspects. Z80 chip’s internal by four parts; 1, and the CPU bus interface; 2, the internal control logic; 3, interrupt control logic; 4, 4 counter / timer.