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Is there other bit needs to set so address data will output from A7 to A0?

Latest Updated:08/30/2011

Question:

I set the operating mode to expansion mode with on-chip ROM enabled, in which the external bus is enabled, but address data is not output from address output pins A7 to A0.
Is there another bit that I need to set?

Answer:

Pins A7 to A0 pin are shared with port A (PA).
If the value of the data direction register (DDR) of PA is 0 these pins cannot be set to address pins. Please check whether PA.DDR is set to 1.

For details, please refer to Port A (PA) in the I/O Ports chapter of the hardware manual.

Suitable Products
RX610