Introduction - If you have any usage issues, please Google them yourself
Design microprocessor basic input output system, the sum of two 2-bit binary number, two numbers A and B, respectively, corresponding to the board (SW3, SW2) and (SW1, sw0), which SW3 SW1 is high. The BTN North (V4) button key operation is performed. When BTN North is pressed, the result of adding two numbers will by LD3 ~ LD0 shows LD3 highest bit, LD0 the least significant bit. HyperTerminal will output the results