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SAM7S Series [DATASHEET]

6175KS–ATARM–25-Oct-12

10.3 Peripheral Multiplexing on PIO Lines

The SAM7S Series features one PIO controller, PIOA, that multiplexes the I/O lines of the peripheral set.

PIO Controller A controls 32 lines (21 lines for SAM7S32/16). Each line can be assigned to one of two peripheral

functions, A or B. Some of them can also be multiplexed with the analog inputs of the ADC Controller.

Table 10-3, “Multiplexing on PIO Controller A (SAM7S512/256/128/64/321/161),” on page 35 and Table 10-4,

“Multiplexing on PIO Controller A (SAM7S32/16),” on page 36 define how the I/O lines of the peripherals A, B or the

analog inputs are multiplexed on the PIO Controller A. The two columns “Function” and “Comments” have been inserted

for the user’s own comments; they may be used to track how pins are defined in an application.

Note that some peripheral functions that are output only may be duplicated in the table.

All pins reset in their Parallel I/O lines function are configured as input with the programmable pull-up enabled, so that the

device is maintained in a static state as soon as a reset is detected.

Table 10-2. Peripheral Identifiers (SAM7S32/16)

Peripheral

Mnemonic

Peripheral

Name

External

Interrupt

AIC

Advanced Interrupt Controller

FIQ

SYSC(1)

System

PIOA

Parallel I/O Controller A

Reserved

4ADC(1)

Analog-to Digital Converter

SPI

Serial Peripheral Interface

6US

USART

Reserved

SSC

Synchronous Serial Controller

TWI

Two-wire Interface

PWMC

PWM Controller

Reserved

TC0

Timer/Counter 0

TC1

Timer/Counter 1

TC2

Timer/Counter 2

15 - 29

Reserved

AIC

Advanced Interrupt Controller

IRQ0

Reserved

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