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在目前市售的单板机中,除了CPU、存贮器、时钟外,通常都有一些输入/输出接口芯片(后面简称I/O)。这些芯片类型很多,如并行I/O、串行I/O、数/摸转换器、模/数转换器和定时/计数芯片等。不同系列的单板机,所带的I/O接口芯片是不同的。同一系列的单板机(如Z-80系列),所带的I/O接口芯片也不尽相同。本讲仅对Z-80单板机的几种常用的接口芯片PIO、CTC及ADC0809作一简
In the current single-board machine, in addition to CPU, memory, clock, usually have some input / output interface chip (hereinafter referred to as I / O). There are many types of these chips, such as parallel I / O, serial I / O, D / A converters, A / D converters and timing / counting chips. Different series of single-board machines, with the I / O interface chip is different. The same series of single-board machines (such as the Z-80 series), with the I / O interface chip is not the same. This talk only on the Z-80 single-chip microcomputer several commonly used interface chip PIO, CTC and ADC0809 for a simple