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Why can't I rewrite the bit rate register (BRR)?

Latest Updated:06/10/2013

Question:

I want to change the bit rate value set in the BRR register of the SCI dynamically without resetting the microcontroller. However, I can't rewrite the bit rate register (BRR). Is there anything I need to be aware of?

Answer:

As stated in the bit rate register (BRR) section of the user's manual: hardware, BRR can be read from by the CPU at all times, but it can be written to only when the TE and RE bits in SCR are 0.

 

Suitable Products
RX62N, RX621
RX62T
RX610
RX62G
RX630
RX63N, RX631
RX63T
RX210
RX220
RX110
RX111