Atmel Evaluation Kit AT91SAM9G25-EK AT91SAM9G25-EK Data Sheet

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SAM9G25 [DATASHEET]

11032C–ATARM–25-Jan-13

The programing example as shown in 

 below is used to obtain the following configuration. 

z

4-bit output port on I/O lines 0 to 3, (should be written in a single write operation), open-drain, with pull-up resistor

z

Four output signals on I/O lines 4 to 7 (to drive LEDs for example), driven high and low, no pull-up resistor, no pull-
down resistor

z

Four input signals on I/O lines 8 to 11 (to read push-button states for example), with pull-up resistors, glitch filters 
and input change interrupts

z

Four input signals on I/O line 12 to 15 to read an external device status (polled, thus no input change interrupt), no 
pull-up resistor, no glitch filter

z

I/O lines 16 to 19 assigned to peripheral A functions with pull-up resistor

z

I/O lines 20 to 23 assigned to peripheral B functions with pull-down resistor

z

I/O line 24 to 27 assigned to peripheral C with Input Change Interrupt, no pull-up resistor and no pull-down resistor

z

I/O line 28 to 31 assigned to peripheral D, no pull-up resistor and no pull-down resistor

PIO_PER

0x0000_FFFF

PIO_PDR

0xFFFF_0000

PIO_OER

0x0000_00FF

PIO_ODR

0xFFFF_FF00

PIO_IFER

0x0000_0F00

PIO_IFDR

0xFFFF_F0FF

PIO_SODR

0x0000_0000

PIO_CODR

0x0FFF_FFFF

PIO_IER

0x0F00_0F00

PIO_IDR

0xF0FF_F0FF

PIO_MDER

0x0000_000F

PIO_MDDR

0xFFFF_FFF0

PIO_PUDR

0xFFF0_00F0

PIO_PUER

0x000F_FF0F

PIO_PPDDR

0xFF0F_FFFF

PIO_PPDER

0x00F0_0000

PIO_ABCDSR1

0xF0F0_0000

PIO_ABCDSR2

0xFF00_0000

PIO_OWER

0x0000_000F

PIO_OWDR

0x0FFF_ FFF0