Hitachi H8/3032 Series Hardware Manual page 528

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TDR—Transmit Data Register
Bit 7
Initial value 1
Read/Write R/W R/W
6 5 4 3
1 1 1 1
R/W R/W R/W
Serial transmit data
513
H'B3 SCI
2 1 0
1 1 1
R/W R/W R/W