Atmel ATSAM3U-EK Data Sheet
Evaluation Kit Hardware
SAM3U-EK Evaluation Kit User Guide
4-7
6478E–ATARM–30-Mar-11
Figure 4-7.
Backup Battery
4.3.6
UART
The Universal Asynchronous Receiver Transmitter features a two-pin UART that can be used for com-
munication and trace purposes. It offers an ideal channel for in-situ programming solutions. This UART
is associated with two PDC channels to reduce the processor time on packet handling.
munication and trace purposes. It offers an ideal channel for in-situ programming solutions. This UART
is associated with two PDC channels to reduce the processor time on packet handling.
This two-pin UART (TXD and RXD only) is buffered through an RS232 Transceiver MN6 and brought to
the DB9 male connector J3.
the DB9 male connector J3.
Figure 4-8.
UART
4.3.7
USART
The Universal Synchronous/Asynchronous Receiver Transmitter (USART) provides one full duplex uni-
versal synchronous/asynchronous serial link. The data frame format is extensively configurable (data
length, parity, number of stop bits) to support a broad range of serial communication standards. The
USART is also associated with PDC channels for TX/RX data access.
versal synchronous/asynchronous serial link. The data frame format is extensively configurable (data
length, parity, number of stop bits) to support a broad range of serial communication standards. The
USART is also associated with PDC channels for TX/RX data access.
There are 3 USARTs on the SAM3U4E device, SAM3U-EK connects the USART1 bus (including TXD,
RXD, RTS, CTS handshake signals control) to the DB9 male connector J4 through the RS232 Trans-
ceiver MN7.
RXD, RTS, CTS handshake signals control) to the DB9 male connector J4 through the RS232 Trans-
ceiver MN7.
+3V 3
DG ND
V B U
DG ND
D6
B AT 54C
B AT 54C
D6
B AT 54C
B AT 54C
3
2
1
MN1B
S AM3U
S AM3U
MN1B
S AM3U
S AM3U
V DDB U
139
CR1 2 2 5
3 V
B T 1
K Y 001
K Y 001
CR1 2 2 5
3 V
B T 1
K Y 001
K Y 001
+
1
-
2
3
3
4
4
C 21
1uF
1uF
C 21
1uF
1uF
J P 4
J P
J P 4
J P
P A12
P A11
P A11
DG ND
+3V 3
DG ND
+3V 3
+3V 3
P A[31:0]
UT XD
URXD
URXD
C 45
100nF
100nF
C 45
100nF
100nF
C 44
100nF
C 44
100nF
C 46
100nF
100nF
C 46
100nF
100nF
R 33
0R
R 33
0R
MN6
MAX3232C S E
MAX3232C S E
MN6
MAX3232C S E
MAX3232C S E
T 1IN
11
T 2IN
10
R 1OUT
12
R 2OUT
9
T 1OUT
14
T 2OUT
7
R 1IN
13
R 2IN
8
V +
2
C 1+
1
C 1-
3
C 2+
4
C 2-
5
V -
6
V C C
16
G ND
15
C 48
100nF
100nF
C 48
100nF
100nF
R 31
100K
100K
R 31
100K
100K
J 3
MALE R IG HT ANG LE D
J 3
MALE R IG HT ANG LE D
5
4
3
2
1
9
8
7
6
10
11
C 47
100nF
100nF
C 47
100nF
100nF
R 103
0R
R 103
0R
T P 17
S MD
T P 17
S MD
T P 18
S MD
T P 18
S MD
R 32
100K
100K
R 32
100K
100K