HOW TO ADD 2BINARY NUMBER USING microcontroller

i need to design cct to add 2 binary numbers each is 4 bit through microcontroller

bero said:

i need to design cct to add 2 binary numbers each is 4 bit through microcontroller

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You need to give a lot more details, this is meaningless!. You need to specify which microcontroller you are using, and there's no circuit design required - just a very simple piece of software, adding two 4 bit numbers should be childs play with any micro - certainly it is with a PIC, and they use a RISC instruction set.