ST72324LS4 STMicroelectronics, ST72324LS4 Datasheet - Page 98

• Manufacturer Part Number: ST72324LS4
• Description: 8-bit MCU
• Manufacturer: STMicroelectronics

Specifications of ST72324LS4

• Hdflash Endurance: 100 cycles, data retention
• Clock Sources: crystal/ceramic resonator oscillators, internal RC oscillator, and bypass for external clock
• Four Power Saving Modes: Halt, Active-Halt, Wait and Slow
• Main Clock Controller With: Real time base, Beep and Clock-out capabilities
• 16-bit Timer A With: 1 input capture, 1 output compare, external clock input, PWM and pulse generator modes
• 16-bit Timer B With: 2 input captures, 2 output compares, PWM and pulse generator modes

ST72324Lxx
SERIAL COMMUNICATIONS INTERFACE (Cont’d)
EXTENDED RECEIVE PRESCALER DIVISION
REGISTER (SCIERPR)
Read/Write
Reset Value: 0000 0000 (00 h)
Allows setting of the Extended Prescaler rate divi-
sion factor for the receive circuit.
Bits 7:0 = ERPR[7:0] 8-bit Extended Receive
Prescaler Register.
The extended Baud Rate Generator is activated
when a value different from 00h is stored in this
register. Therefore the clock frequency issued
from the 16 divider (see
the binary factor set in the SCIERPR register (in
the range 1 to 255).
The extended baud rate generator is not used af-
ter a reset.
Table 22. Baudrate Selection
98/154
1
ERPR
Symbol
7
7
f
f
Rx
Tx
ERPR
6
Communication frequency 8 MHz
ERPR
5
Parameter
ERPR
4
Figure
ERPR
3
ERPR
52) is divided by
2
f
CPU
ERPR
1
Accuracy vs
Standard
~0.16%
~0.79%
ERPR
0
0
Conditions
EXTENDED TRANSMIT PRESCALER DIVISION
REGISTER (SCIETPR)
Read/Write
Reset Value:0000 0000 (00 h)
Allows setting of the External Prescaler rate divi-
sion factor for the transmit circuit.
Bits 7:0 = ETPR[7:0] 8-bit Extended Transmit
Prescaler Register.
The extended Baud Rate Generator is activated
when a value different from 00h is stored in this
register. Therefore the clock frequency issued
from the 16 divider (see
the binary factor set in the SCIETPR register (in
the range 1 to 255).
The extended baud rate generator is not used af-
ter a reset.
Conventional Mode
TR (or RR)=128, PR=13
TR (or RR)= 32, PR=13
TR (or RR)= 16, PR=13
TR (or RR)= 8, PR=13
TR (or RR)= 4, PR=13
TR (or RR)= 16, PR= 3
TR (or RR)= 2, PR=13
TR (or RR)= 1, PR=13
Extended Mode
ETPR (or ERPR) = 35,
TR (or RR)= 1, PR=1
ETPR
7
7
ETPR
Prescaler
6
ETPR
5
ETPR
4
Standard
Figure
ETPR
3
10400
19200
38400
14400 ~14285.71
1200
2400
4800
9600
300
ETPR
52) is divided by
2
~10416.67
~19230.77
~38461.54
~1201.92
~2403.84
~4807.69
~9615.38
Baud
~300.48
Rate
ETPR
1
ETPR
Unit
Hz
0
0