MC81F4x16
24.3 Baud rate calculations
Mode 2
The baud rate in mode 2 is fixed at the fxx clock frequency divided by 16:
Mode 2 baud rate = fxx/16
Modes 0, 1 and 3
In modes 0, 1 and 3, the baud rate is determined by the UART baud rate data register, BRDAT:
Mode 0, 1 and 3 baud rate = fu/(16 × (BRDATA + 1))
BRDAT
Mode
Baud Rate
UART Clock
DEC
X
HEX
X
Mode 2
0.5 MHz
8 MHz
230,400 Hz
115,200 Hz
57,600 Hz
38,400 Hz
19,200 Hz
9,600 Hz
11.0592 MHz
11.0592 MHz
11.0592 MHz
11.0592 MHz
11.0592 MHz
11.0592 MHz
11.0592 MHz
10 MHz
02
05
11
17
35
71
143
09
64
12
39
12
25
02H
05H
0BH
11H
23H
47H
8FH
09H
40H
0CH
27H
0CH
19H
4,800 Hz
62,500 Hz
9,615 Hz
10 MHz
38,461 Hz
12,500 Hz
19,230 Hz
9,615 Hz
8 MHz
8 MHz
4 MHz
4 MHz
Figure 24-5 Commonly Used Baud Rates Generated by BRDAT
October 19, 2009 Ver.1.35
159
FINECHIPS [ FINECHIPS ]
