Renesas H8/3067 Series User Manual page 527

The BRR setting is calculated as follows:
Asynchronous mode:
Synchronous mode:
B: Bit rate (bit/s)
N: BRR setting for baud rate generator (0 ≤ N ≤ 255)
φ: System clock frequency (MHz)
n: Baud rate generator clock source (n = 0, 1, 2, 3)
(For the clock sources and values of n, see the following table.)
n
0
1
2
3
The bit rate error in asynchronous mode is calculated as follows:
Error (%) =
φ
N =
64 × 2
φ
N =
8 × 2
2n−1
Clock Source
φ
φ/4
φ/16
φ/64
φ × 10
(N + 1) × B × 64 × 2
Section 13 Serial Communication Interface
× 10
× B
2n−1
× 10
× B
SMR Settings
CKS1
0
0
1
1
6
2n−1
Rev. 4.00 Jan 26, 2006 page 503 of 938
− 1
6
− 1
6
CKS0
0
1
0
1
× 100
− 1
REJ09B0276-0400