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You will need to write a test program, which could, for example, exercise all the port pins, peripherals, etc. You may eeven need to build a special circuit just to test it. Since this is a microcontroller, testing it is necessarily complicated.
i agree with VVV. But more of what i think is basically, you want to check wheteher your chip is carrying out all the funtions for which it has been programmed, right? if so prepare out standard steps for it. or send us more details
Write a Testing Program by making all the Port bits to set and Reset, and for testing serial port connect it to PC and send any one charactor from pc and compare that in uC if it is the Exact code i.e the code which u have set for comparision then transmit continues Charactor to PC.
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