CHAPTER 12 SERIAL INTERFACE 20
User’s Manual U15075EJ2V1UD
233
(ii) Generation of transmit/receive clock for baud rate from external clock input from ASCK20
pin
The transmit/receive clock is generated by scaling the clock input from the ASCK20 pin. The baud
rate of a clock generated from the clock input to the ASCK20 pin is estimated by using the following
expression.
[Baud rate] = [bps]
f
ASCK
: Frequency of clock input to ASCK20 pin
Table 12-6. Relationship Between ASCK20 Pin Input Frequency
and Baud Rate (When BRGC20 Is Set to 80H)
Baud Rate (bps)
ASCK20 Pin Input Frequency (kHz)
75 1.2
150 2.4
300 4.8
600 9.6
1,200 19.2
2,400 38.4
4,800 76.8
9,600 153.6
19,200 307.2
31,250 500.0
38,400 614.4
f
ASCK
16
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