參數(shù)資料
型號: μPD78F9197Y
廠商: NEC Corp.
英文描述: 8 Bit Single Chip Microcontrollers(8 位單片微控制器)
中文描述: 8位單片機微控制器(8位單片微控制器)
文件頁數(shù): 73/150頁
文件大?。?/td> 636K
代理商: ΜPD78F9197Y
Preliminary Product Information
73
μ
PD78F9197Y
The transmission and reception clock pulses used to generate the baud rate are obtained by dividing the
frequency of the main system clock pulse or a signal input to the ASCK20 pin.
(i)
Generating transmission and reception clock pulses for baud rates based on the main system
clock
The frequency of the main system clock is divided to generate the transmission and reception clock
pulses. The baud rate generated based on the main system clock is determined using the following
expression.
[Baud rate] = f
2
f
X
: Main system clock oscillation frequency
Table 7-14. Relationships between Main System Clock Frequencies and Baud Rates (Example)
Error (%)
f
X
= 5.0 MHz
f
X
= 4.9152 MHz
1,200
8
70H
1.73
0
2,400
7
60H
4,800
6
50H
9,600
5
40H
19,200
4
30H
38,400
3
20H
76,800
2
10H
Caution
Do not select n = 1 during operation at f
X
= 5.0 MHz, as n = 1 causes the rated baud rate to be
exceeded.
Baud rate
(bps)
BRGC20 setting
X
×
8
n
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