CHAPTER 13 SERIAL INTERFACE 20
User’s Manual U13045EJ2V0UM00
181
The baud rate transmit/receive clock to be generated is either a signal scaled from the system clock, or
a signal scaled from the clock input from the ASCK20 pin.
(i)
Generation of baud rate transmit/receive clock by means of system clock
The transmit/receive clock is generated by scaling the system clock. The baud rate generated from
the system clock is estimated by using the following expression.
[Baud rate] = [Hz]
f
X
: System clock oscillation frequency (ceramic/crystal oscillation)
n: Values in the above table specified by the setting in TPS200 to TPS203 (2
≤
n
≤
8)
Table 13-5. Example of Relationship between System Clock and Baud Rate
Baud Rate (bps)
n
BRGC20 Set Value
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
f
x
2
n + 1
×
8
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