NEC uPD78P078 User Manual
Page 477
477
CHAPTER 20 SERIAL INTERFACE CHANNEL 2
(ii) Generation of baud rate transmit/receive clock by means of external clock from ASCK pin
The transmit/receive clock is generated by scaling the clock input from the ASCK pin. The baud
rate generated from the clock input from the ASCK pin is obtained with the following expression.
[Baud rate] = [Hz]
where,
f
ASCK
: Frequency of clock input to ASCK pin
k
: Value set in MDL0 to MDL3 (0
≤
k
≤
14)
Table 20-6. Relationship between ASCK Pin Input Frequency and Baud Rate (When BRGC is set to 00H)
Baud Rate (bps)
ASCK Pin Input Frequency
75
2.4 kHz
110
3.52 kHz
150
4.8 kHz
300
9.6 kHz
600
19.2 kHz
1200
38.4 kHz
2400
76.8 kHz
4800
153.6 kHz
9600
307.2 kHz
19200
614.4 kHz
31250
1000.0 kHz
38400
1228.8 kHz
2
n
x (k + 16)
f
ASCK