| 摘要 |
The circuit for transmitting and receiving the data between a local card and a main board in the key telephone or PABX system rapidly exchanges the information data. The circuit comprises a serial/parallel converter (100), cnnected with a main processor (MPUO) of the main board, to convert the serial data into the parallel data, a data bit converter (200) for converting the output of the serial/parallel converter and transmitting/receiving the data in the 8 bits unit, nd a local card, including a local processor (MPU1), for providing a shift clock (SCLK) to the main board.
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