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Would there be any problem using read value instruction?

Latest Updated:06/20/2013

Question:

A reserved bit has been allocated to the I/O register. Would there be any problem using its read value or a read-modify-write instruction?

Answer:

The handling of reserved bits is described in the Register Descriptions section of each chapter of the hardware manual. Please refer to the relevant registers.
Read-modify-write instructions cannot be used for a register that contains a reserved bit for which read is undefined and write is a fixed value (0 or 1). For such registers, please write bytes in a specified access size.
Suitable Products
RX62N, RX621
RX62T
RX610
RX62G
RX630
RX63N, RX631
RX63T
RX210
RX220
RX110
RX111
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