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AN3123 Datasheet(PDF) 22 Page - STMicroelectronics

Part # AN3123
Description  Using the UART interfaces in the SPEAr embedded MPU family
PDF  30 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN3123 Datasheet(HTML) 22 Page - STMicroelectronics

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UART modem operation
AN3123
22/30
Doc ID 16862 Rev 2
Figure 2.
DTE to DCE connection
Figure 3.
DTE to DTE connection
1
2
3
4
5
6
7
8
9
DSR input
RXD input
RTS output
TXD output
CTS input
DTR output
GND
1
2
3
4
5
6
7
8
9
DSR
RXD
RTS
TXD
CTS
DTR
GND
DTE to DCE RS-232 cable
DSUB9 female to DSUB9 male connector
Data Terminal Equipment
DSUB9 male connector
1
2
3
4
5
6
7
8
9
DSR output
RXD output
RTS input
TXD input
CTS output
DTR input
GND
Data Communication Equipment
DSUB9 female connector
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
DSR input
RXD input
RTS output
TXD output
CTS input
DTR output
GND
1
2
3
4
5
6
7
8
9
DSR
RXD
RTS
TXD
CTS
DTR
GND
5
4
3
2
1
9
8
7
6
GND
DTR
CTS
TXD
RTS
RXD
DSR
5
4
3
2
1
9
8
7
6
GND
DTR output
CTS input
TXD output
RTS output
RXD input
DSR input
Data Terminal Equipment
DSUB9 male connector
DTE to DTE RS-232 null modem cable
DSUB9 female to DSUB9 female connector
Data Terminal Equipment
DSUB9 male connector



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