236
Table 10.6
BRR Settings and Bit Rates in Asynchronous Mode (cont)
OSC (MHz)
9.8304
10
Bit Rate
(bits/s)
n
N
Error
(%)
n
N
Error
(%)
110
2
86
+0.31
2
88
–0.25
150
1
255
0
2
64
+0.16
300
1
127
0
1
129
+0.16
600
0
255
0
1
64
+0.16
1200
0
127
0
0
129
+0.16
2400
0
63
0
0
64
+0.16
4800
0
31
0
0
32
–1.36
9600
0
15
0
0
15
+1.73
19200
0
7
0
0
7
+1.73
31250
0
4
–1.70
0
4
0
38400
0
3
0
0
3
+1.73
Notes: 1. Settings should be made so that error is within 1%.
2. BRR setting values are derived by the following equation.
N =
×
10
6
– 1
OSC
64
×
2
2n
×
B
B:
Bit rate (bits/s)
N:
BRR baud rate generator setting (0
≤
N
≤
255)
OSC: Value of ø
OSC
(MHz)
n:
Baud rate generator input clock number (n = 0, 1, 2, 3)
The meaning of n is shown in table 10.7.
Table 10.7
Relation between n and Clock
SMR Setting
n
Clock
CKS1
CKS0
0
ø
0
0
1
ø/4
0
1
2
ø16
1
0
3
ø/64
1
1