ATMEGA1284P-XPLD【PDF 7/15 页】MEGA-1284P XPLAINED EVAL KIT

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AVR364

Please note that programming the Atmel AT32UC3B1256 using a programming

tool will erase the boot loader.

Please refer to the Atmel application note, AVR370: MEGA-1284P Xplained

Getting Started Guide, for more details regarding how to program the onboard

microcontrollers.

4.2 I/O expansion headers

There are four available I/O expansion headers in the kit. Because of the low pin

count on the device, the I/O expansion header pins are shared with onboard

functionality. If “clean” expansion ports are needed, cut-straps are available to

remove onboard functionality. Table 4-2 through Table 4-5 show what is shared on

the respective header pins.

Table 4-2. Atmel MEGA-1284P Xplained I/O expansion header – J1.

Pin

1

2

3

4

J1

TWI SDA

TWI SCL

USART RXD0

USART TXD0

ATmega1284P pin

PC1

PC0

PD0

PD1

Shared with onboard functionality

Header J4, board controller

Header J4, board controller

Header J4

Header J4

5

SPI SS

(1)

PB4

Board controller

6

7

SPI MOSI

SPI MISO

(1)

(1)

PB5

PB6

Header J4, DataFlash, board controller

Header J4, DataFlash, board controller

8

SPI SCK

(1)

PB7

Header J4, DataFlash, board controller

9

10

GND

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.

Table 4-3. MEGA-1284P Xplained I/O expansion header – J2.

Pin

J2

ATmega1284P pin

Shared with onboard functionality

1

2

3

4

5

6

7

8

ADC0

ADC1

ADC2

ADC3

ADC4

ADC5

ADC6

ADC7

(1)

(2)

(2)

(2)

PA0

PA1

PA2

PA3

PA4

PA5

PA6

PA7

Possible to connect to AREF

-

-

-

-

Filter output

Light sensor

NTC sensor

9

10

GND

VCC_ANA_P3V3

-

-

-

-

Notes:

1. AREF with 100nF capacitor to GND can be connected to ADC0 by shorting two

pads marked EXTERNAL AREF on the bottom side of the board.

2. These signals can be disconnected from the sensor/filter output by cutting the

cut-straps marked SENSORS & FILTER on the bottom side of the board.

7

8377B-AVR-11/11

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