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Can pins A20 to A23 be used as general I/O ports instead of output pins?

Latest Updated:05/20/2014

Question:

When enabling external bus extension in the RX210 Group, can pins A20 to A23 be used as general I/O ports or peripheral function I/O ports instead of address output pins? (examples: A20 as SSLA0, A21 as RSPCKA, A22 as CS1#, A23 as PC7)

Answer:

Yes. Set the address A20 output enable bit (A20E) to the address A23 output enable bit (A23E) of address output enable register 1 (PFAOE1) to 0 (output disabled).
For how to set the external bus pins, see the application note "RX210 Group Setting External Bus Pins" (R01AN1014EJ0100).
Suitable Products
RX210