文件名称:iul
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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 serial interface chip 8251A8.4 analog/digital (A/D) and digital-to-analog (D/A ) converter technology and its interface
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 serial interface chip 8251A8.4 analog/digital (A/D) and digital-to-analog (D/A ) converter technology and its interface
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