r4f2426 Renesas Electronics Corporation., r4f2426 Datasheet - Page 887

• Manufacturer Part Number: r4f2426
• Description: 16-bit Single-chip Microcomputer H8s Family / H8s/2400 Series
• Manufacturer: Renesas Electronics Corporation.

15.3.9
BRR is an 8-bit register that adjusts the bit rate. As the SCI performs baud rate generator control
independently for each channel, different bit rates can be set for each channel. Table 15.2 shows
the relationships between the N setting in BRR and bit rate B for normal asynchronous mode,
clocked synchronous mode, and Smart Card interface mode. The initial value of BRR is H'FF, and
it can be read or written to by the CPU at all times.
Table 15.2 Relationships between N Setting in BRR and Bit Rate B
Note: B: Bit rate (bit/s)
Mode
Asynchronous
Mode
Clocked
Synchronous
Mode
Smart Card
Interface Mode
CKS1
0
0
1
1
SMR Setting
N: BRR setting for baud rate generator (0 ≤ N ≤ 255)
φ: Operating frequency (MHz)
n and S: Determined by the SMR settings shown in the following tables.
Bit Rate Register (BRR)
CKS0
0
1
0
1
Bit Rate
B =
B =
B =
n
0
1
2
3
64 × 2
S × 2
8 × 2
2n−1
2n+1
φ × 10
φ × 10
φ × 10
2n−1
× (N + 1)
× (N + 1)
× (N + 1)
6
6
6
SCMR Setting
BCP2
0
0
0
0
1
1
1
1
Error
Error (%) = {
Section 15 Serial Communication Interface (SCI, IrDA)
BCP1
0
0
1
1
0
0
1
1
Rev. 1.00 Sep. 19, 2008 Page 859 of 1270
B × S × 2
SMR Setting
φ × 10
2n+1
BCP0
0
1
0
1
0
1
0
1
6
× (N + 1)
REJ09B0466-0100
− 1 } × 100
S
93
128
186
512
32
64
372
256