
Board Description
4.2.6.3
User Serial Com Port
The USART1 is used as a user serial communication port. This USART1 is buffered with an RS-232
Transceiver (TXD, RXD and handshake CTS/RTS control) and connected to the DB-9 male socket. Soft-
ware must assign the appropriate PIO pins (PB5 = RXD1, PB4 = TXD1, PD16 = RTS1, PD17 = CTS1) to
enable the UART1 function.
Figure 4-9.
User Serial Com Port
MN16
3 V 3
3 V 3
1
C1+
VCC
16
C161
R S 2 3 2 COM PORT
C160
100n
R 8 9
R 8 6
100n
3
4
C1-
C2+
GND
V+
15
2
C162
100n
J11
100k
100k
C164
100n
1
6
PB4
5
11
C2-
T
V-
6
14
C166
100n
2
7
3
8
4
PD16
PB5
PD17
10
12
9
T
R
R
7
1 3
8
9
5
ADM 3 202ARNZ
Refer to the SAM9M10 datasheet for more information about the SAM9M10 USARTs.
4.2.6.4
USB Port
The SAM9M10-G45-EK features USB communication ports:
Two Host Ports: Full speed OHCI and High speed EHCI
One Device Port: High speed.
USB Host Port0 is directly connected to the first UTMI transceiver. The second Host Port (Port1) is mul-
tiplexed with the USB Device High speed and connected to the second UTMI port.
One USB high/full speed type standard A connector
One USB interface Host/Device Micro AB connector
Refer to the SAM9M10 datasheet for detailed programming information.
AT91SAM9M10-G45-EK User Guide
4-11
6495B–ATARM–21-Apr-10