Atmel Evaluation Kit AT91SAM9M10-G45-EK AT91SAM9M10-G45-EK データシート

 448

SAM9M10 [DATASHEET]

6355F–ATARM–12-Mar-13

The programing example as shown in 

 below is used to define the following configuration. 

• 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

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

• 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

• 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

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

• I/O lines 20 to 23 assigned to peripheral B functions, no pull-up resistor

• I/O line 24 to 27 assigned to peripheral A with Input Change Interrupt and pull-up resistor 

Programming Example 

PIO_PER

0x0000 FFFF

PIO_PDR

0x0FFF 0000

PIO_OER

0x0000 00FF

PIO_ODR

0x0FFF FF00

PIO_IFER

0x0000 0F00

PIO_IFDR

0x0FFF F0FF

PIO_SODR

0x0000 0000

PIO_CODR

0x0FFF FFFF

PIO_IER

0x0F00 0F00

PIO_IDR

0x00FF F0FF

PIO_MDER

0x0000 000F

PIO_MDDR

0x0FFF FFF0

PIO_PUDR

0x00F0 00F0

PIO_PUER

0x0F0F FF0F

PIO_ASR

0x0F0F 0000

PIO_BSR

0x00F0 0000

PIO_OWER

0x0000 000F

PIO_OWDR

0x0FFF FFF0