| 摘要 |
A serial communication circuit sends or receives a large amount of data speedily. A buffer (2a) is connected to a serial interface circuit (1a),and a buffer (2b) is connected to a serial interface circuit (1b). One end of a switch (4) is connected to the serial interface circuit (1a) or the serial interface circuit 1b, and another end to a serial port (3). Switching the switch (4) sequentially to the serial interface circuit (1a) and to the serial interface circuit (1b) makes it possible to use the two buffers for sending data to, or receiving data from, one serial port (3). <IMAGE>
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