HD6412320 RENESAS [Renesas Technology Corp], HD6412320 Datasheet - Page 650

• Manufacturer Part Number: HD6412320
• Description: Renesas 16-Bit Single-Chip Microcomputer H8S Family H8S-2300 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

Section 14 Serial Communication Interface (SCI)
The BRR setting is found from the following formulas.
Asynchronous mode:
Synchronous mode:
Where B: Bit rate (bits/s)
The bit rate error in asynchronous mode is found from the following formula:
Rev.6.00 Sep. 27, 2007 Page 620 of 1268
REJ09B0220-0600
N =
N =
Error (%) = {
N: BRR setting for baud rate generator (0 ≤ N ≤ 255)
φ: Operating frequency (MHz)
n: Baud rate generator input clock (n = 0 to 3)
n
0
1
2
3
(See the table below for the relation between n and the clock.)
64 × 2
8 × 2
Clock
φ
φ/4
φ/16
φ/64
2n–1
φ
2n–1
φ
(N + 1) × B × 64 × 2
× B
× B
× 10
× 10
CKS1
0
0
1
1
φ × 10
6
6
– 1
– 1
SMR Setting
6
CKS0
0
1
0
1
2n–1
– 1} × 100