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What SCI3 SSR bit to use to know if the serial transmission is available?

Latest Updated:03/25/2009

Question:

Which control bits of the SCI3 Serial Status Register (SSR) should be checked to know the availability of serial transmission?

Answer:

Please check TDRE bit of serial status register (SSR) for transmission enable. If TDRE = 1, the next data can be transferred.

The transmitter have a double-buffered structure, enabling continuous data transfer during transmission by writing transmission data into the transmit data register (TDR) after confirming TDRE=1.

TEND bit of SSR is provided to confirm whether transmission is completed or not. TEND is set to 0 during transmission. When you want to complete serial communication or switch pin function, please perform it after confirming TEND=0.

 

Suitable Products
H8/300H Super Low Power
H8/38602R
H8/38086R
H8/38086
H8/38076R
H8/300L Super Low Power
H8/3887
H8/3867
H8/3857
H8/3854F
H8/3854
H8/38024R, 38024, 38024S, 38124
H8/38024F
H8/3824
H8/3802, 38002S, 38004, 38104
H8 Super Low Power