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How to implement 2 serial port for interfacing with a single UART microcontroller

 

 I am designing an interface board based on a single UART 8051 family microcontroller.The interface needs two serial port;one for system serial bus and another for networking through a serial-ethernet converter.Is it possible to implement a software UART using two normal pin of micro?Is there any way to share the single UART of the micro for the two puposes?

 

http://www.keil.com/forum/6104/