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1、第第2 2章章 单片机原理与应用单片机原理与应用Principles Principles and Applications of and Applications of MicrocontrollerMicrocontrollerChapter 2.2 Pinout Description of 8051 MCUn本节课将介绍8051单片机的外围引脚；n介绍8051的基本电路连接。Chapter 2.2 Pinout Description of 8051 MCUChapter 2.2 Pinout Description of 8051 MCU1.Basic connectionChapt
2、er 2.2 Pinout Description of 8051 MCU2.Reliable designPartial circuits of Auto SamplerChapter 2.2 Pinout Description of 8051 MCU3.EA,ALE&PSEN1、EA=0:active,to ignore the internal program EA=1:default,both of the internal and external program can be used2、ALE:Address Lock EnableTo indicate the usage of port P0.EA=0:External memory used ALE=0:P0 is used as data bus ALE=1:Address bus