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Table 11-4 Examples of Bit Rates and BRR Settings in Synchronous Mode
2
4
Bit Rate
n
N
n
(bits/s)
110
3
70
—
250
2
124
2
500
1
249
2
1 k
1
124
1
2.5 k
0
199
1
5 k
0
99
0
10 k
0
49
0
25 k
0
19
0
50 k
0
9
0
100 k
0
4
0
250 k
0
1
0
500 k
0
0*
0
1 M
0
2 M
2.5 M
4 M
Note: Settings with an error of 1% or less are recommended.
Legend
Blank: No setting available
—:
Setting possible, but error occurs
*:
Continuous transmit/receive not possible
The BRR setting is calculated as follows:
Asynchronous mode:
ø
× 10
6
N =
– 1
64 × 2
× B
2n–1
Synchronous mode:
ø
× 10
6
N =
– 1
8 × 2
× B
2n–1
B: Bit rate (bits/s)
N: BRR setting for baud rate generator (0 ≤ N ≤ 255)
ø: System clock frequency (MHz)
n: Baud rate generator clock source (n = 0, 1, 2, 3)
(For the clock sources and values of n, see the table below.)
ø (MHz)
8
10
N
n
N
n
N
—
—
—
—
—
249
3
124
—
—
124
2
249
—
—
249
2
124
—
—
99
1
199
1
249
199
1
99
1
124
99
0
199
0
249
39
0
79
0
99
19
0
39
0
49
9
0
19
0
24
3
0
7
0
9
1
0
3
0
4
0*
0
1
—
—
0
0*
—
—
—
—
0
0*
333
16
n
N
—
—
3
249
3
124
2
249
2
99
1
199
1
99
0
159
0
79
0
39
0
15
0
7
0
3
0
1
—
—
0
0*
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