h8s-2161b Renesas Electronics Corporation., h8s-2161b Datasheet - Page 423

• Manufacturer Part Number: h8s-2161b
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 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 and
clocked synchronous mode. The initial value of BRR is H'FF, and it can be read from or written to
by the CPU at all times.
Table 15.2 Relationships between N Setting in BRR and Bit Rate B
Legend:
B:
N: BRR setting for baud rate generator (0
n:
Table 15.3 shows sample N settings in BRR in normal asynchronous mode. Table 15.4 shows the
maximum bit rate settable for each frequency. Table 15.6 shows sample N settings in BRR in
clocked synchronous mode. Tables 15.5 and 15.7 show the maximum bit rates with external clock
input.
Mode
Asynchronous mode
Clocked synchronous mode
:
Operating frequency (MHz)
Determined by the SMR settings shown in the following table.
Bit rate (bit/s)
CKS1
0
0
1
1
Bit Rate Register (BRR)
SMR Setting
CKS0
0
1
0
1
n
0
1
2
3
Bit Rate
B =
B =
64
64
Section 15 Serial Communication Interface (SCI and IrDA)
2
2
2n-1
2n-1
N
10
10
6
6
(N+1)
(N+1)
255)
Rev. 3.00 Mar 21, 2006 page 369 of 788
Error
Error (%) = {
—
B
64
2
REJ09B0300-0300
10
2n-1
6
(N+1)
– 1 }
100