AT45DB161D-SS View Datasheet(PDF) - Atmel Corporation
Part Name
Description
MFG CO.
'AT45DB161D-SS' PDF : 19 Pages View PDF
Atmel AVR1923
This however will disable the JTAG interface until the connection is reestablished by,
for example soldering a bridge on the cut-strap.
4.2 I/O expansion headers
NOTE
The Atmel AVR XMEGA-A3BU Xplained headers J1, J2, J3, and J4 offer access to
the I/O of the microcontroller in order to expand the board, for example by mounting a
top module onto the board.
The header J1 offers digital communication interfaces like UART, TWI and SPI. Table
4-2 shows how the Atmel AVR XMEGA is connected to the header.
When using TWI please note that no pull-ups are mounted on the board from the
factory, so it is required to either enable the internal pull-ups of the device or to mount
the external pull-ups on the available footprints (R200 and R201). Please refer to the
assembly drawing in the design documentation for the location of these footprints.
Table 4-2. Expansion header J1.
Pin on J1
Name on J1 XMEGA pin
Shared with onboard functionality
1
SDA
PC0
-
2
SCL
PC1
-
3
RXD
PC2
-
4
TXD
PC3
-
5
SS
PC4
-
6
MOSI
PC5
-
7
MISO
PC6
-
8
SCK
PC7
-
9
GND
-
-
10
VCC_P3V3
-
-
The header J2 is connected to analog ports of the XMEGA as shown in Table 4-3.
Table 4-3. Expansion header J2.
Pin on J2
Name on J2 XMEGA pin
Shared with onboard functionality
1
ADC0
PB0
-
2
ADC1
PB1
-
3
ADC2
PB2
-
4
ADC3
PB3
-
5
ADC4
PA4
-
6
ADC5
PA5
-
7
ADC6
PA6
-
8
ADC7
PA7
-
9
GND
-
-
10
VCC_P3V3
-
-
The I/O connected to the expansion header J3 is shared with on-board features as
sensors and JTAG interface. Therefore care must be taken when J3 is used for
expansions. Table 4-4 shows the mapping of the XMEGA I/O to J3.
7
8394B-AVR-02/12
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