ATSAM3X-EK Atmel, ATSAM3X-EK Datasheet - Page 14

• Manufacturer Part Number: ATSAM3X-EK
• Description: Development Boards & Kits - ARM EVAL KIT SAM3X & SAM3A series
• Manufacturer: Atmel

Specifications of ATSAM3X-EK

• Rohs: yes
• Product: Evaluation Kits
• Tool Is For Evaluation Of: SAM3X
• Core: ARM Cortex M3
• Interface Type: Serial
• Operating Supply Voltage: 3.3 V
• Factory Pack Quantity: 1

11156A–ATARM–25-May-12
4.3.6
Figure 4-8.
4.3.7
4-6
UART
USART
UART
VDDCORE and VDDPLL can also be powered by an external supply. (Refer to the SAM3X datasheet for
more details).
VDDBU pin is powered from the 3.3V rail and a backup battery BT1 via a dual Schottky diode D1.
Figure 4-7.
The Universal Asynchronous Receiver Transmitter features a two-pin UART that can be used for com-
munication and trace purposes and offers an ideal medium for on-site programming solutions. Moreover,
the association with two peripheral DMA controller (PDC) channels permits packet handling for these
tasks with processor time reduced to a minimum.
This two-pin UART (TXD and RXD only) is buffered through an RS232 Transceiver MN14 and brought to
the DB9 male connector J11.
The Universal Synchronous Asynchronous Receiver Transceiver (USART) provides one full duplex uni-
versal synchronous asynchronous serial link. Data frame format is widely programmable (data length,
parity, number of stop bits) to support a maximum of standards. The receiver implements parity error,
framing error and overrun error detection. The receiver time-out enables handling variable-length frames
and the transmitter timeguard facilitates communications with slow remote devices. Multidrop communi-
cations are also supported through address bit handling in reception and transmission.
The USART features three test modes: remote loopback, local loopback and automatic echo.
The USART supports specific operating modes providing interfaces on RS485, LIN and SPI buses, with
ISO7816 T = 0 or T = 1 smart card slots and infrared transceivers. The hardware handshaking feature
enables an out-of-band flow control by automatic management of the pins RTS and CTS.
The USART supports the connection to the Peripheral DMA Controller, which enables data transfers to
the transmitter and from the receiver. The PDC provides chained buffer management without any inter-
vention of the processor.
[3]
[3]
PA9
PA8
(UTXD)
(URXD)
Backup Battery
+3V3
R111
R111
100K
100K
+3V3
R112
R112
100K
100K
+3V3
C121
C121
100nF
100nF
[3]
VDDBU
100nF
100nF
C119
C119
C124
C124
100nF
100nF
16
15
11
12
10
2
6
9
MN14
MN14
MAX3232CSE
MAX3232CSE
VCC
V+
V-
GND
T1IN
R1OUT
T2IN
R2OUT
UART
JP2
JP2
T1OUT
T2OUT
3
R1IN
R2IN
C1+
C2+
C1-
C2-
D1
D1
BAT54C
BAT54C
100nF
100nF
C6
C6
1
3
4
5
14
13
7
8
1
2
+3V3
C120
C120
100nF
100nF
C123
C123
100nF
100nF
BT1
BT1
CR12_16_20_25
CR12_16_20_25
1
6
2
7
3
8
4
9
5
J11
J11
SAM3X-EK User Guide