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Which control bits of SCI3 SSR to check to know the availability of SI?

Latest Updated:03/26/2009

Question:

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

Answer:

The TE bit of SC13 register is provided to control the transmission, so please confirm the status of the TE bit.

If you want to check the status where the transmission is already completed, this can be made easily with TEND. During transmission, TEND is cleared to 0, and at the moment transmission is completed, set to 1. Immediately you write transmission data on TRD, TDRE is set to 1 to show that TDR is empty. When you transmit continuously, confirm TDRE=1 and then write transmission data.

Suitable Products
H8/300H Tiny
H8/36109
H8/36087
H8/36077, H8/36079
H8/36064
H8/36049
H8/36037, H8/36057
H8/36014, H8/36024
H8/3694
H8/3687
H8/3672
H8/3664
H8/36912, H8/36902