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Can the TxD and RxD pins be used as a port?

Latest Updated:10/06/2010

Question:

When only reception is performed using the serial interface in clock asynchronous serial I/O mode, can the TxD pin be used as a port? Also, when only transmission is performed, can the RxD pin be used as a port?

Answer:

From the point in time that the serial I/O select bit is set to clock synchronous serial I/O mode or clock asynchronous serial I/O mode, the TxD pin cannot be used as a port, regardless of the settings of the transmit enable bit/receive enable bit.
When only transmission is performed, the RxD pin can be used as a port.
Suitable Products
R8C/1x
R8C/2x