并口扩展芯片8255a技术资料
讲述8255的用法,读写例程,Description TheIntersil82C55AisahighperformanceCMOSversionof theindustrystandard8255Aandismanufacturedusinga self-alignedsilicongateCMOSprocess(ScaledSAJIIV).It isageneralpurposeprogrammableI/Odevicewhichmaybe usedwithmanydifferentmicroprocessors.Thereare24I/O pinswhichmaybeindividual
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不错，正好可用