Datasheet

Section 15 Serial Communication Interface (SCI, IrDA)
Rev. 4.00 Sep 27, 2006 page 446 of 1130
REJ09B0327-0400
The BRR setting is found from the following equations.
Asynchronous mode:
N = × 10
6
– 1
64 × 2
2n–1
× B
φ
Synchronous mode:
N = × 10
6
– 1
8 × 2
2n–1
× B
φ
Where B: Bit rate (bits/s)
N: BRR setting for baud rate generator (0 ≤ N ≤ 255)
φ: Operating frequency (MHz)
n: Baud rate generator input clock (n = 0 to 3)
(See the table below for the relation between n and the clock.)
SMR Setting
n Clock CKS1 CKS0
0 φ 00
1 φ/4 0 1
2 φ/16 1 0
3 φ/64 1 1
The bit rate error in asynchronous mode is found from the following equation:
Error (%) = – 1 × 100
(N + 1) × B × 64 × 2
2n–1
× 10
6






φ