参数资料
型号: AT91SAM9X25-EK
厂商: Atmel
文件页数: 39/95页
文件大小: 0K
描述: KIT EVAL FOR AT91SAM9G25
标准包装: 1
系列: AT91SAM
类型: MCU
适用于相关产品: AT91SAM9X25
所含物品: 板,线缆,电源
Evaluation Kit Hardware
4.3.3.5
USART
The USART0 and USART3 are used as serial communication ports. Both USARTs are buffered with an
RS-232 Transceiver (TXD, RXD and handshake CTS/RTS control) and connected to the DB-9 male
socket. The software must assign the appropriate PIO pins to enable the USART function.
The USART3 is only supported by SAM9G25 and SAM9X25 processors. The RS-232 Transceiver for
USART3 is enabled by the signal SELCONFIG comprised of a pull down resistor on CM board. Ref to
Figure 4-22. USART Com Port
VDDIOP0
USART0
VDDIOP0
C13
4.7u
C14
100n
3
23
MN4
VCC
GND
C1+
C1-
6
20
C16
100n
1
J8
C15
100n
1
V+
C2+
2
C17
100n
6
2
R22
R23
R24
C18
100n
21
V-
C2-
4
7
3
19
SD
C3+
24
C19
100n
8
4
47k
47k
47k
5
EN
C3-
22
9
5
PA2
PA0
PA3
PA1
RTS0
TXD0
CTS0
RXD0
R27
R28
R30
R31
0R
0R
0R
0R
7
8
9
10
11
12
T1IN
T2IN
T3IN
R1OUT
R2OUT
R3OUT
T1OUT
T2OUT
T3OUT
R1IN
R2IN
R3IN
18
17
16
15
14
13
R29
0R
RTSC0
TXDC0
CTSC0
RXDC0
L5
220ohm at 100MHz
1 2
ADM3312EARU
EARTH_RS232
USART3
VDDIOP1
(only for SAM9G25/SAM9X25)
VDDIOP1
C28
4.7u
C29
100n
C35
100n
3
23
1
MN9
VCC
GND
V+
C1+
C1-
C2+
6
20
2
C32
C34
100n
100n
1
6
2
J12
R61
R62
R63
R64
C37
100n
21
V-
C2-
4
7
3
19
SD
C3+
24
C39
100n
8
4
SELCONFIG
PC24
PC22
RTS3
TXD3
R65
R66
0R
0R
47k
47k
47k
47k
5
7
8
9
EN
T1IN
T2IN
T3IN
C3-
T1OUT
T2OUT
T3OUT
22
18
17
16
RTSC3
TXDC3
9
5
PC25
PC23
CTS3
RXD3
R69
R70
0R
0R
10
11
12
R1OUT
R2OUT
R3OUT
R1IN
R2IN
R3IN
15
14
13
R68
0R
CTSC3
RXDC3
4-28
11115A–ATARM–27-Jul-11
ADM3312EARU
EARTH_RS232
Evaluation Kit (EK) User Guide
相关PDF资料
PDF描述
AT91SAM9G25-EK KIT EVAL FOR AT91SAM9G25
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