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Connect the MCU to the PC with a level shifter (MAX232 or other method). Write a program for the MCU to receive RS232 and do something with the data it receives so you'll know something happened. Set up Hyperterminal to match the baud rate and other stuff that you programmed the MCU to receive (typically you'll start at 9600-8-N-1. Go faster later, after you get that working).sohagiut said:how can i send data from pc tp mic-controller using serial port. can i use Hyperterminal. how?