Hitachi H8S/2628 Hardware Manual page 334

Bit Bit Name
1 CKS1
0 CKS0
Rev. 1.0, 09/02, page 298 of 568
Initial Value R/W
0 R/W
0 R/W
Description
Clock Select 0 and 1
These bits select the clock source for the baud
rate generator.
00: φ clock (n = 0)
01: φ/4 clock (n = 1)
10: φ/16 clock (n = 2)
11: φ/64 clock (n = 3)
For the relationship between the bit rate register
setting and the baud rate, see section 14.3.9, Bit
Rate Register (BRR). n is the decimal
representation of the value of n in BRR (see
section 14.3.9, Bit Rate Register (BRR)).