User manual

AVR364

8377B-AVR-11/11

Table 4-4. Atmel MEGA-1284P Xplained I/O expansion header – J3.

Pin J3 ATmega1284P pin Shared with onboard functionality

1 GPIO0 PB0 SW0, LED0

2 GPIO1 PB1 SW1, LED2

3 GPIO2 PB2 SW2, LED3

4 GPIO3 PB3 LED1

5 GPIO4 PD4 J4 (SPI SS1), DataFlash (SPI SS1)

6 GPIO5

(1)

PD5 Filter input

7 GPIO6 PC4 JTAG(TDO)

8 GPIO7 PC5 JTAG(TDI)

9 GND - -

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 J4 ATmega1284P pin Shared with onboard functionality

1 TWI SDA PC1 Header J1, board controller

2 TWI SCL PC0 Header J1, board controller

3 USART RXD1 PD2 Board controller

4 USART TXD1 PD3 Board controller

5 SPI SS1 PD4 Header J3 (GPIO4), DataFlash

6 SPI MOSI

(1)

PB5 Header J1, DataFlash, board controller

7 SPI MISO

(1)

PB6 Header J1, DataFlash, board controller

8 SPI SCK

(1)

PB7 Header J1, DataFlash, board controller

9 GND - -

10 VCC_P3V3 - -

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.