MC80F0224 Datasheet, PDF (87/128 Pages) List of Unclassifed Manufacturers – 8-BIT SINGLE-CHIP MICROCONTROLLERS

Preliminary
MC80F0208/16/24
17.4 Relationship between main clock and baud rate
The transmit/receive clock that is used to generate the baud rate
is obtained by dividing the main system clock. Transmit/Receive
clock generation for baud rate is made by using main system
clock which is divided. The baud rate generated from the main
system clock is determined according to the following formula.
Baud Rate
(bps)
f_XIN=11.0592M
BRGCR
ERR
(%)
600
-
-
1200
-
-
2400
72H
0.00
4800
62H
0.00
9600
52H
0.00
19200
42H
0.00
31250
36H
0.53
38400
32H
0.00
57600
28H
0.00
76800
22H
0.00
115200
18H
0.00
f_XIN=10.0M
BRGCR
ERR
(%)
-
-
-
-
70H
1.73
60H
1.73
50H
1.73
40H
1.73
34H
0.00
30H
1.73
26H
1.35
20H
1.73
16H
1.36
f_XIN=8.0M
BRGCR
ERR
(%)
-
-
7AH
0.16
6AH
0.16
5AH
0.16
4AH
0.16
3AH
0.16
30H
0.00
2AH
0.16
21H
2.11
1AH
0.16
11H
2.12
f_XIN=6.0M
BRGCR
ERR
(%)
-
-
74H
2.34
64H
2.34
54H
2.34
44H
2.34
34H
2.34
28H
0.00
24H
2.34
1AH
0.16
14H
2.34
-
-
f_XIN=4.0M
BRGCR
ERR
(%)
7AH 0.16
6AH 0.16
5AH 0.16
4AH 0.16
3AH 0.16
2AH 0.16
20H 0.00
1AH 0.16
11H 2.12
-
-
-
-
f_XIN=2.0M
BRGCR
ERR
(%)
6AH 0.16
5AH 0.16
4AH 0.16
3AH 0.16
2AH 0.16
1AH 0.16
10H 0.00
-
-
-
-
-
-
-
-
Baud Rate = f_XIN / ( 2ⁿ⁺¹(k+16) )
Remarks 1. f_XIN : Main system clock oscillation frequency
When ACLK is selected as the source clock of the 5-bit counter,
substitute the input clock frequency to ACLK pin for in the above expression.
2. f_SCK : Source clock for 5 bit counter
3. n : Value set via TPS00 to TPS02 ( 0 ≤ n ≤ 7 )
4. k : Source clock for 5 bit counter ( 0 ≤ k ≤ 14 )
Figure 17-9 Relationship between main clock and Baud Rate
MAR. 2005 Ver 0.2
83