Hitachi H8S/2646 Hardware Manual page 538

Bits 3 to 0—Operate in the same way as for the normal SCI. For details, see section 13.2.7, Serial
Status Register (SSR).
However, the setting conditions for the TEND bit, are as shown below.
Bit 2
TEND Description
0 Transmission is in progress
[Clearing conditions]
•
When 0 is written to TDRE after reading TDRE = 1
•
When the DTC is activated by a TXI interrupt and write data to TDR
1 Transmission has ended
[Setting conditions]
•
Upon reset, and in standby mode or module stop mode
•
When the TE bit in SCR is 0 and the ERS bit is also 0
•
When TDRE = 1 and ERS = 0 (normal transmission) 2.5 etu after transmission of a
1-byte serial character when GM = 0 and BLK = 0
•
When TDRE = 1 and ERS = 0 (normal transmission) 1.5 etu after transmission of a
1-byte serial character when GM = 0 and BLK = 1
•
When TDRE = 1 and ERS = 0 (normal transmission) 1.0 etu after transmission of a
1-byte serial character when GM = 1 and BLK = 0
•
When TDRE = 1 and ERS = 0 (normal transmission) 1.0 etu after transmission of a
1-byte serial character when GM = 1 and BLK = 1
Note: etu: Elementary Time Unit (time for transfer of 1 bit)
506
(Initial value)