MC80F0204 Datasheet, PDF (81/126 Pages) List of Unclassifed Manufacturers – 8-BIT SINGLE-CHIP MICROCONTROLLERS

Preliminary
MC80F0104/0204
16.4 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. Trans-
mit/Receive clock generation for baud rate is made by us-
ing main system clock which is divided. The baud rate
generated from the main system clock is determined ac-
cording to the following formula.
Baud Rate
(bps)
f_XIN=11.05
92M
BRGCR
600
-
1200
-
2400
72H
4800
62H
9600
52H
19200
42H
31250
36H
38400
32H
57600
28H
76800
22H
115200
18H
f_XIN=10.0M
ERR(%)
-
-
0.00
0.00
0.00
0.00
0.53
0.00
0.00
0.00
0.00
BRGCR
-
-
70H
60H
50H
40H
34H
30H
26H
20H
16H
ERR(%)
-
-
1.73
1.73
1.73
1.73
0.00
1.73
1.35
1.73
1.36
f_XIN=8.0M
BRGCR
-
7AH
6AH
5AH
4AH
3AH
30H
2AH
21H
1AH
11H
ERR(%)
-
0.16
0.16
0.16
0.16
0.16
0.00
0.16
2.11
0.16
2.12
f_XIN=4.0M
BRGCR
7AH
6AH
5AH
4AH
3AH
2AH
20H
1AH
11H
-
-
ERR
(%)
0.16
0.16
0.16
0.16
0.16
0.16
0.00
0.16
2.12
-
-
f_XIN=2.0M
BRGCR
6AH
5AH
4AH
3AH
2AH
1AH
10H
-
-
-
-
ERR(%)
0.16
0.16
0.16
0.16
0.16
0.16
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 TPS0 to TPS2 ( 0 ≤ n ≤ 7 )
4. k : Source clock for 5 bit counter ( 0 ≤ k ≤ 14 )
Figure 16-7 Relationship between main clock and Baud Rate
Mar. 2005 Ver 0.2
77