AT91SAM9261 datasheet(29/688 Pages) ATMEL

29 / 688 page

6062F–ATARM–05-Dec-06

AT91SAM9261 Preliminary

Note:

Setting AIC, SYSIRQ, UHP, LCDC and IRQ0 to IRQ2 bits in the clock set/clear registers

of the PMC has no effect.

10.3

Peripheral Multiplexing on PIO Lines

The AT91SAM9261 features three PIO controllers, PIOA, PIOB and PIOC, that multi-

plex the I/O lines of the peripheral set.

Each PIO Controller controls up to thirty-two lines. Each line can be assigned to one of

two peripheral functions, A or B. Table 10-2 on page 32, Table 10-3 on page 33 and

Table 10-4 on page 34 define how the I/O lines of the peripherals A and B are multi-

plexed on the PIO Controllers. 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.

Table 10-1.

Peripheral Identifiers

Peripheral ID

Peripheral Mnemonic

Peripheral Name

External Interrupt

AIC

Advanced Interrupt Controller

FIQ

SYSIRQ

System Interrupt

PIOA

Parallel I/O Controller A

PIOB

Parallel I/O Controller B

PIOC

Parallel I/O Controller C

Reserved

US0

USART 0

US1

USART 1

US2

USART 2

MCI

Multimedia Card Interface

UDP

USB Device Port

TWI

Two-wire Interface

SPI0

Serial Peripheral Interface 0

SPI1

Serial Peripheral Interface 1

SSC0

Synchronous Serial Controller 0

SSC1

Synchronous Serial Controller 1

SSC2

Synchronous Serial Controller 2

TC0

Timer/Counter 0

TC1

Timer/Counter 1

TC2

Timer/Counter 2

UHP

USB Host Port

LCDC

LCD Controller

22 - 28

Reserved

AIC

Advanced Interrupt Controller

IRQ0

AIC

Advanced Interrupt Controller

IRQ1

AIC

Advanced Interrupt Controller

IRQ2

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