Fujitsu MB91460 SERIES FR60 User Manual page 660

Chapter 32 USART (LIN / FIFO)
6.USART Baud Rates
■ Suggested Division Ratios for different machine speeds and baud rates
The following settings are suggested for different MCU clock speeds and baud rates:
Table 6-1 Suggested Baud Rates and reload values at different machine speeds.
8 MHz
Baud
rate %
value
dev.
2M 3 0
1M 7 0
500000 15 0
460800 - -
250000 31 0
230400 - -
153600 51 -0.16
125000 63 0
115200 - -
76800 103 -0.16
57600 138 0.08
38400 207 -0.16
28800 277 0.08
19200 416 0.08
10417 767 <0.01
9600 832 0.04
7200 1110 <0.01
4800 1666 0.02
2400 3332 <0.01
1200 6666 <0.01
600 13332 <0.01
300 26666 <0.01
■ Counting Example
Assume the reload value is 832. The figure
644
10 MHz 16 MHz
%
value value
dev.
4 0 7
9 0 15
19 0 31
- - -
39 0 63
- - -
64 -0.16 103
79 0 127
86 0.22 138
129 -0.16 207
173 0.22 277
259 -0.16 416
346 <0.01 554
520 0.03 832
959 <0.01 1535
1041 0.03 1666
1388 <0.01 2221
2082 -0.02 3332
4166 <0.01 6666
8334 0.02 13332
16666 <0.01 26666
- - -
6-2
20 MHz
% %
value
dev. dev.
0 9 0
0 19 0
0 39 0
- -
0 79 0
- 86 0.22
-0.16 129 -0.16
0 159 0
0.08 173 0.22
-0.16 259 -0.16
0.08 346 -0.06
0.08 520 0.03
-0.01 693 -0.06
-0.03 1041 0.03
<0.01 1919 <0.01
0.02 2083 0.03
<0.01 2777 <0.01
<0.01 4166 <0.01
<0.01 8332 <0.01
<0.01 16666 <0.01
<0.01 -
- -
demonstrates the behavior of the both Reload Counters:
24 MHz
%
value
dev.
11 0
23 0
47 0
- 51 -0.16
95 0
103 -0.16
155 -0.16
191 0
207 -0.16
311 -0.16
416 0.08
624 0
832 -0.03
1249 0
2303 <0.01
2499 0
3332 <0.01
4999 0
9999 0
19999 0
- - -
- - -
32 MHz
%
value
dev.
15 0
31 0
63 0
- -
127 0
138 -0.08
207 0.16
255 0
278 -0.08
416 0.08
555 0.08
832 -0.04
1110 -0.01
1666 0.02
3071 <0.01
3332 0.01
4443 -0.01
6666 <0.01
13332 <0.01
26666 <0.01