3069RF-ZTAT Datasheet, PDF (485/1003 Pages) Renesas Technology Corp – RENESAS 16-BIT SINGLE-CHIP MICROCOMPUTER

Bits 1 and 0—Clock Select 1 and 0 (CKS1/0): These bits select the clock source for the on-chip
baud rate generator. Four clock sources are available: φ, φ/4, φ/16, and φ/64.
For the relationship between the clock source, bit rate register setting, and baud rate, see section
13.2.8, Bit Rate Register (BRR).
Bit 1
CKS1
0
0
1
1
Bit 0
CKS0
0
1
0
1
Description
φ
φ/4
φ/16
φ/64
(Initial value)
Rev. 5.0, 09/04, page 463 of 978