Fujitsu Semiconductor Controller MB89950/950A Hardware Manual page 210

CHAPTER 10 UART
Table 10.1-4 "Transfer cycle and transfer rate by baud rate generator" is shown the example of baud rate
when using the dedicated baud rate generator.
Table 10.1-4 Transfer cycle and transfer rate by baud rate generator
RC2 RC1 RC0
0 0 0
0 0 1
0 1 0
0 1 1
1 0 0
1 0 1
1 1 0
1 1 1
Furthermore, Figure 10.1-1 "Sample calculation of the baud rate" shows the formula of calculating the baud
rate.
Baud rate value =
F : Main clock oscillation frequency
CH
196
4.912 MHz
Division ratio
20
21
22
23
24
25
26
27
Figure 10.1-1 Sample calculation of the baud rate
CPU cloc k
F
CH
Input clock divider
X
2
PDS1, PDS0
Baud rate (bps)
5 MHz
1/4 1/4
1/64 1/8
9600 78125
4800 39063
2400 19531
1200 9766
600 4883
300 2441
150 1221
75 610
Transfer clock divider
X
CR, CS1, CS0
Input clock
1/65 PDS division
1/16 CS1, CS0, CR division
2404
1202
601
300
150
75
38
19
Baud rate divider
X
RC2, RC1, RC0