Datasheet

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11011AS–ATARM–04-Oct-10
SAM3N Summary
9.8 SysTick Timer
• 24-bit down counter
• Self-reload capability
• Flexible System timer
9.9 Real-time Timer
• Real-time Timer, allowing backup of time with different accuracies
– 32-bit Free-running back-up Counter
– Integrates a 16-bit programmable prescaler running on slow clock
– Alarm register capable to generate a wake-up of the system through the Shut Down
Controller
9.10 Real Time Clock
• Low power consumption
• Full asynchronous design
• Two hundred year calendar
• Programmable Periodic Interrupt
• Alarm and update parallel load
• Control of alarm and update Time/Calendar Data In
9.11 General Purpose Backup Registers
• Eight 32-bit general-purpose backup registers
9.12 Nested Vectored Interrupt Controller
• Thirty Two maskable external interrupts
• Sixteen priority levels
• Processor state automatically saved on interrupt entry, and restored on
• Dynamic reprioritization of interrupts
• Priority grouping
– selection of pre-empting interrupt levels and non pre-empting interrupt levels
• Support for tail-chaining and late arrival of interrupts
– back-to-back interrupt processing without the overhead of state saving and
restoration between interrupts.
• Processor state automatically saved on interrupt entry and restored on interrupt exit, with no
instruction overhead