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Parrot: SCM and PC-PC communication program design method: ⑴ serial initialization: baud rate set at 4800 ⑵ receiving serial data: serial data reception at the initialization state, when the arrival of serial data when receiving serial data stored in temporary register ⑶ serial send data: such as data receiving, upon completion, will register in the temporary data sent through the serial port to the data source. ⑷ experimental testing methods: In the host computer through serial debugging assistant software sends a hexadecimal data to the single-chip, single-chip data received immediately after the data also sent back to the PC, and in serial debugging aides show .