AT91SAM7S256D-AU Atmel, AT91SAM7S256D-AU Datasheet - Page 161

• Manufacturer Part Number: AT91SAM7S256D-AU
• Description: ARM Microcontrollers - MCU 256K Flash SRAM 64K ARM based MCU
• Manufacturer: Atmel
• Series: SAM7S256r

Specifications of AT91SAM7S256D-AU

• Rohs: yes
• Core: ARM
• Processor Series: AT91SAM
• Data Bus Width: 16 bit/32 bit
• Maximum Clock Frequency: 55 MHz
• Program Memory Size: 256 KB
• Data Ram Size: 64 KB
• On-chip Adc: Yes
• Operating Supply Voltage: 3 V to 3.6 V
• Operating Temperature Range: - 40 C to + 85 C
• Package / Case: LQFP-64
• Mounting Style: SMD/SMT
• Interface Type: 2-Wire, I2S, SPI, USART
• Length: 7 mm

23. Advanced Interrupt Controller (AIC)
23.1
23.2
Overview
The Advanced Interrupt Controller (AIC) is an 8-level priority, individually maskable, vectored interrupt controller,
providing handling of up to thirty-two interrupt sources. It is designed to substantially reduce the software and real-
time overhead in handling internal and external interrupts.
The AIC drives the nFIQ (fast interrupt request) and the nIRQ (standard interrupt request) inputs of an ARM pro-
cessor. Inputs of the AIC are either internal peripheral interrupts or external interrupts coming from the product's
pins.
The 8-level Priority Controller allows the user to define the priority for each interrupt source, thus permitting higher
priority interrupts to be serviced even if a lower priority interrupt is being treated.
Internal interrupt sources can be programmed to be level sensitive or edge triggered. External interrupt sources
can be programmed to be positive-edge or negative-edge triggered or high-level or low-level sensitive.
The fast forcing feature redirects any internal or external interrupt source to provide a fast interrupt rather than a
normal interrupt.
Block Diagram
Figure 23-1. Block Diagram
Embedded
PeripheralEE
Embedded
Peripheral
Embedded
Peripheral
IRQ0-IRQn
FIQ
Thirty-two
Sources
Up to
AIC
APB
nIRQ
nFIQ
Processor
SAM7S Series [DATASHEET]
ARM
6175M–ATARM–26-Oct-12
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