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Table 4-4. Atmel MEGA-1284P Xplained I/O expansion header – J3.
Pin
1
2
3
4
5
J3
GPIO0
GPIO1
GPIO2
GPIO3
GPIO4
ATmega1284P pin
PB0
PB1
PB2
PB3
PD4
Shared with onboard functionality
SW0, LED0
SW1, LED2
SW2, LED3
LED1
J4 (SPI SS1), DataFlash (SPI SS1)
6
7
8
9
GPIO5
GPIO6
GPIO7
GND
(1)
PD5
PC4
PC5
-
Filter input
JTAG(TDO)
JTAG(TDI)
-
10
VCC_P5V0
(2)
-
-
Notes:
1. This signal can be disconnected from the filter input by cutting the cut-strap
marked FILTER INPUT in the SENSORS & FILTER section on the bottom side
of the board.
2. Pin 10 of header J3 is connected to the USB voltage (VCC_P5V0).
Table 4-5. MEGA-1284P Xplained I/O expansion header – J4.
Pin
1
2
3
4
5
J4
TWI SDA
TWI SCL
USART RXD1
USART TXD1
SPI SS1
ATmega1284P pin
PC1
PC0
PD2
PD3
PD4
Shared with onboard functionality
Header J1, board controller
Header J1, board controller
Board controller
Board controller
Header J3 (GPIO4), DataFlash
6
7
SPI MOSI
SPI MISO
(1)
(1)
PB5
PB6
Header J1, DataFlash, board controller
Header J1, DataFlash, board controller
8
9
10
SPI SCK (1)
GND
VCC_P3V3
PB7
-
-
Header J1, DataFlash, board controller
-
-
Note:
1. These signals can be disconnected from the board controller by cutting the cut-
straps marked SPI on the bottom side of the board.
8
AVR364
8377B-AVR-11/11
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