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Can I write to the TDR register before transmission is enabled?

Latest Updated:06/10/2013

Question:

In the Example of Serial Transmission Flowchart in Asynchronous Mode in the user's manual, it says:
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[1] SCI initialization:
The TxDn pin is automatically designated as the transmit data output pin. After the TE bit in SCR is set to 1, a 1 is output for a frame, and transmission is enabled.
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Can I write to the TDR register before transmission is enabled?

Answer:

Yes, it is not necessary to wait to until after a 1 is output for a frame. Please perform data writing within the TXI interrupt that is generated after initialization.
Suitable Products
RX62N, RX621
RX62T
RX610
RX62G
RX630
RX63N, RX631
RX63T
RX210
RX220
RX110
RX111