AT91SAM7S32-AI ATMEL [ATMEL Corporation], AT91SAM7S32-AI Datasheet - Page 205

• Manufacturer Part Number: AT91SAM7S32-AI
• Description: AT91 ARM Thumb-based Microcontrollers
• Manufacturer: ATMEL [ATMEL Corporation]

I/O Lines
Programming
Example
6071A–ATARM–28-Oct-04
The programing example as shown in Table 51 below is used to define the following
configuration.
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Table 51. Programming Example
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
PIO_OWER
PIO_OWDR
PIO_CODR
PIO_MDER
PIO_MDDR
PIO_SODR
PIO_PUDR
PIO_PUER
PIO_IFDR
PIO_ODR
PIO_IFER
PIO_PER
PIO_PDR
PIO_OER
PIO_ASR
PIO_BSR
Register
PIO_IER
PIO_IDR
AT91SAM7S32 Preliminary
Value to be Written
0x0FFF FFFF
0x0000 FFFF
0x0FFF FF00
0x0FFF F0FF
0x00FF F0FF
0x0FFF FFF0
0x0F0F FF0F
0x0FFF FFF0
0x0FFF 0000
0x0000 00FF
0x0F00 0F00
0x00F0 00F0
0x0F0F 0000
0x0000 0F00
0x0000 0000
0x0000 000F
0x00F0 0000
0x0000 000F
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