AT91SAM9261 datasheet(26/43 Pages) ATMEL

26 / 43 page

6062KS–ATARM–15-Jan-09

AT91SAM9261 Preliminary

9.10

Advanced Interrupt Controller

• Controls the interrupt lines (nIRQ and nFIQ) of an ARM Processor

• Thirty-two individually maskable and vectored interrupt sources

– Source 0 is reserved for the Fast Interrupt Input (FIQ)

– Source 1 is reserved for system peripherals (PIT, RTT, PMC, DBGU, etc.)

– Source 2 to Source 31 control up to thirty embedded peripheral interrupts or external

interrupts

– Programmable edge-triggered or level-sensitive internal sources

– Programmable positive/negative edge-triggered or high/low level-sensitive

• Four External Sources

• 8-level Priority Controller

– Drives the normal interrupt of the processor

– Handles priority of the interrupt sources 1 to 31

– Higher priority interrupts can be served during service of lower priority interrupt

• Vectoring

– Optimizes Interrupt Service Routine Branch and Execution

– One 32-bit Vector Register per interrupt source

– Interrupt Vector Register reads the corresponding current Interrupt Vector

•Protect Mode

– Easy debugging by preventing automatic operations when protect mode is enabled

•Fast Forcing

– Permits redirecting any normal interrupt source on the Fast Interrupt of the

processor

• General Interrupt Mask

– Provides processor synchronization on events without triggering an interrupt

9.11

Debug Unit

• Composed of four functions

–Two-pin UART

– Debug Communication Channel (DCC) support

– Chip ID Registers

– ICE Access Prevention

•Two-pin UART

– Implemented features are 100% compatible with the standard Atmel USART

– Independent receiver and transmitter with a common programmable Baud Rate

Generator

– Even, Odd, Mark or Space Parity Generation

– Parity, Framing and Overrun Error Detection

– Automatic Echo, Local Loopback and Remote Loopback Channel Modes

– Support for two PDC channels with connection to receiver and transmitter

• Debug Communication Channel Support

AT91SAM9261 数据表(PDF) 26 Page - ATMEL Corporation

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