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Table 8-3. Examples of BRR Settings in Asynchronous Mode (4)
14.7456
Bit
Error
rate
n
N
(%)
110
2
130 –0.07
150
2
95
0
300
1
191 0
600
1
95
0
1200
0
191 0
2400
0
95
0
4800
0
47
0
9600
0
23
0
19200 0
11
0
31250 —
—
—
38400 0
5
0
Note: If possible, the error should be within 1%.
B = OSC × 10
/[64 × 2
6
N: BRR value (0 ≤ N ≤ 255)
OSC: Crystal oscillator frequency in MHz
B: Bit rate (bits/second)
n: Internal clock source (0, 1, 2, or 3)
The meaning of n is given by the table below:
n
CKS1
0
0
1
0
2
1
3
1
XTAL frequency (MHz)
16
Error
n
N
(%)
2
141 +0.03
2
103 +0.16
1
207 +0.16
1
103 +0.16
0
207 +0.16
0
103 +0.16
0
51
+0.16
0
25
+0.16
0
12
+0.16
0
7
0
—
—
—
× (N + 1)]
2n
CKS0
Clock
0
Ø
1
Ø/4
0
Ø/16
1
Ø/64
19.6608
Error
n
N
(%)
2
174
–0.26
2
127
0
1
255
0
1
127
0
0
255
0
0
127
0
0
63
0
0
31
0
0
15
0
0
9
–1.70
0
7
0
179
20
Error
n
N
(%)
3
43
+0.88
2
129
+0.16
2
64
+0.16
1
129
+0.16
1
64
+0.16
0
129
+0.16
0
64
+0.16
0
32
–1.36
0
15
+1.73
0
9
0
0
7
+1.73
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