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- 8.1 可编程并行接口芯片8255A 8.2 可编程定时器/计数器芯片8253/8254 8.3 串行通信及可编程串行接口芯片8251A 8.4 模/数(A/D)与数模(D/A)转换技术 及其接口 -8.1 programmable parallel interface chip 8255A8.2 programmable timer/counter chip 8253/82548.3 serial communications and programmable seri