Section 12 Serial Communication Interface (SCI)
Rev. 3.00 Sep. 27, 2007 Page 431 of 758
REJ09B0243-0300
12.3.10 Bit Rate Register (SCBRR)
SCBRR is an 8-bit register that, together with the baud rate generator clock source selected by the
CKS1 and CKS0 bits in the serial mode register (SCSMR), determines the serial transmit/receive
bit rate.
The CPU can always read and write to SCBRR.
The SCBRR setting is calculated as follows:
Bit:
Initial value:
R/W:
7
6
5
4
3
2
1
0
1
1
1
1
1
1
1
1
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
•
Asynchronous mode:
N =
×
10
6
- 1
64
×
2
2n-1
×
B
P
φ
•
Clock synchronous mode:
N =
×
10
6
- 1
8
×
2
2n-1
×
B
P
φ
B: Bit rate (bits/s)
N: SCBRR setting for baud rate generator (0
≤
N
≤
255)
(The setting value should satisfy the electrical characteristics.)
P
φ
: Operating frequency for peripheral modules (MHz)
n:
Baud rate generator clock source (n
=
0, 1, 2, 3) (for the clock sources and values of
n, see table 12.3.)
Содержание SH7124 R5F7124
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