Hitachi H8/329 Series Hardware Manual page 319

BRR—Bit Rate Register
Bit 7
Initial value 1
Read/Write R/W
6 5 4
1 1 1
R/W R/W R/W
Constant that determines the bit rate
H'FFD9
3 2
1 1
R/W R/W
310
SCI
1 0
1 1
R/W R/W