h8s-2172 Renesas Electronics Corporation., h8s-2172 Datasheet - Page 332

• Manufacturer Part Number: h8s-2172
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family H8s-2100 Series
• Manufacturer: Renesas Electronics Corporation.

11.3.8
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 11.2 shows
the relationships between the N setting in BRR and bit rate B for asynchronous mode. The initial
value of BRR is H'FF, and it can be read or written to by the CPU at all times.
Table 11.2 Relationships between N Setting in BRR and Bit Rate B
Note: B: Bit rate (bit/s)
Table 11.3 shows sample N settings in BRR in asynchronous mode. Table 11.4 shows the
maximum bit rate for each frequency in asynchronous mode.
Rev. 2.00, 03/04, page 300 of 534
Mode
Asynchronous
Mode
CKS1
0
0
1
1
N: BRR setting for baud rate generator (0 ≤ N ≤ 255)
φ: Operating frequency (MHz)
n: Determined by the SMR settings shown in the following tables.
SMR Setting
Bit Rate Register (BRR)
CKS0
0
1
0
1
Bit Rate
B =
64
2
φ
2n−1
n
0
1
2
3
10
6
(N + 1)
Error
Error (%) = {
B
64
φ
2
2n−1
10
6
(N + 1)
− 1 }
100