ST7232AK2B5 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
ST7232AK2B5
STMicroelectronics
ST7232AK2B5 Datasheet PDF : 157 Pages
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ST7232A
SERIAL COMMUNICATIONS INTERFACE (Cont’d)
EXTENDED RECEIVE PRESCALER DIVISION EXTENDED TRANSMIT PRESCALER DIVISION
REGISTER (SCIERPR)
REGISTER (SCIETPR)
Read/Write
Read/Write
Reset Value: 0000 0000 (00h)
Reset Value:0000 0000 (00h)
Allows setting of the Extended Prescaler rate divi- Allows setting of the External Prescaler rate divi-
sion factor for the receive circuit.
sion factor for the transmit circuit.
7
0
ERPR ERPR ERPR ERPR ERPR ERPR ERPR ERPR
7
6
5
4
3
2
1
0
7
0
ETPR ETPR ETPR ETPR ETPR ETPR ETPR ETPR
7
6
5
4
3
2
1
0
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 53) 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.
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 53) 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
Symbol
Parameter
Conditions
fCPU
Accuracy
vs. Standard
Prescaler
Conventional Mode
TR (or RR)=128, PR=13
TR (or RR)= 32, PR=13
TR (or RR)= 16, PR=13
~0.16%
TR (or RR)= 8, PR=13
fTx
Communication frequency 8MHz
fRx
TR (or RR)= 4, PR=13
TR (or RR)= 16, PR= 3
TR (or RR)= 2, PR=13
TR (or RR)= 1, PR=13
~0.79%
Extended Mode
ETPR (or ERPR) = 35,
TR (or RR)= 1, PR=1
Standard
Baud
Rate
Unit
300 ~300.48
1200 ~1201.92
2400 ~2403.84
4800 ~4807.69
9600 ~9615.38
10400 ~10416.67 Hz
19200 ~19230.77
38400 ~38461.54
14400 ~14285.71
101/157
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