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Can all four pins to be used as I/O ports when using RSPI?

Latest Updated:01/23/2014

Question:

When using the RSPI for full duplex communication, I would like to use the SSL pins as I/O ports. Can all four pins (SSL0 to 3) be used as I/O ports?

Answer:

Yes. By setting the RSPI mode select bit (SPMS) to 0 and the communications operating mode select bit (TXMD) to 1 in the RSPI control register (SPCR), full duplex clock synchronous (three-line) communication can be performed without using the slave select (SSL) pins.
Suitable Products
RX630
RX63N, RX631
RX210