| 摘要 |
In a serial communication unit having a CRC calculator or in a single-chip micro-computer including the serial communication unit, the CRC calculator is operated in synchronism with a system clock which is different from and asynchronous with respect to a reception clock. As a result, the CRC calculation is prevented from being stopped by the interruption of the reception clock, or the CRC calculation by the software is unnecessitated, thereby improving the communication efficiency.
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