Datasheet

ST72334J/N, ST72314J/N, ST72124J
137/153
COMMUNICATIONS INTERFACE CHARACTERISTICS (Cont’d)
16.11.2 SCI - Serial Communications Interface
Subject to general operating condition for V
DD
, f
O-
SC
, and T
A
unless otherwise specified.
Refer to I/O port characteristics for more details on
the input/output alternate function characteristics
(RDI and TDO).
Symbol Parameter
Conditions
Standard
Baud
Rate
Unit
f
CPU
Accuracy
vs. Standard
Prescaler
f
Tx
f
Rx
Communication frequency 8MHz
~0.16%
Conventional Mode
TR (or RR)=64, PR=13
TR (or RR)=16, PR=13
TR (or RR)= 8, PR=13
TR (or RR)= 4, PR=13
TR (or RR)= 2, PR=13
TR (or RR)= 8, PR= 3
TR (or RR)= 1, PR=13
300
1200
2400
4800
9600
10400
19200
~300.48
~1201.92
~2403.84
~4807.69
~9615.38
~10416.67
~19230.77
Hz
Extended Mode
ETPR (or ERPR) = 13 38400 ~38461.54
~0.79%
Extended Mode
ETPR (or ERPR) = 35 14400 ~14285.71