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ST72324BL 데이터시트(PDF) 98 Page - STMicroelectronics

부품명 ST72324BL
상세설명  3V RANGE 8-BIT MCU WITH 8 TO 32K FLASH/ROM, 10-BIT ADC, 4 TIMERS, SPI, SCI INTERFACE
PDF  151 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
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ST72324BL 데이터시트(HTML) 98 Page - STMicroelectronics

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SERIAL COMMUNICATIONS INTERFACE (Cont’d)
EXTENDED RECEIVE PRESCALER DIVISION
REGISTER (SCIERPR)
Read/Write
Reset Value: 0000 0000 (00h)
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 Figure 51) is divided by
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.
EXTENDED TRANSMIT PRESCALER DIVISION
REGISTER (SCIETPR)
Read/Write
Reset Value:0000 0000 (00h)
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 Figure 51) is divided by
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.
Table 21. Baudrate Selection
70
ERPR
7
ERPR
6
ERPR
5
ERPR
4
ERPR
3
ERPR
2
ERPR
1
ERPR
0
70
ETPR
7
ETPR
6
ETPR
5
ETPR
4
ETPR
3
ETPR
2
ETPR
1
ETPR
0
Symbol
Parameter
Conditions
Standard
Baud
Rate
Unit
fCPU
Accuracy
vs. Standard
Prescaler
fTx
fRx
Communication frequency
8MHz
~0.16%
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
300
1200
2400
4800
9600
10400
19200
38400
~300.48
~1201.92
~2403.84
~4807.69
~9615.38
~10416.67
~19230.77
~38461.54
Hz
~0.79%
Extended Mode
ETPR (or ERPR) = 35,
TR (or RR)= 1, PR=1
14400 ~14285.71
1



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