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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 2.3 Input/Output Ports of 8051 MCU 3.Input/Output Ports-P0If theres no pull-up resistor,what will happen?(1)Data/Address Bus(2)Input/Output twofunctionsChapter 2.3 Input/Output
2、 Ports of 8051 MCU4.Input/Output Ports-P1 Only one function:Input/Output With built-in pull-up resistor Chapter 2.3 Input/Output Ports of 8051 MCU5.Input/Output Ports-P2Two functions:Address Bus/Input outputWith built-in pull-up resistorChapter 2.3 Input/Output Ports of 8051 MCU6.Input/Output Ports-P3Each pin can be used as:General I/O or Special function pin With built-in pull-up resistor