Datasheet

37
11090BS–ATARM–22-Oct-13
SAM3S8/SD8 Summary
10.9 Real-Time Timer
• Real-Time Timer, allowing backup of time with different accuracies
– 32-bit Free-running backup 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
10.10 Real Time Clock
• Low power consumption
• Full asynchronous design
• Two hundred year Gregorian and Persian calendar
• Programmable Periodic Interrupt
• Trimmable 32.7682 kHz crystal oscillator clock source
• Alarm and update parallel load
• Control of alarm and update Time/Calendar Data In
• Waveform output capability on GPIO pins in low power modes
10.11 General-Purpose Backed-up Registers
• Eight 32-bit backup general-purpose registers
10.12 Nested Vectored Interrupt Controller
• Thirty maskable external interrupts
• Sixteen priority levels
• Processor state automatically saved on interrupt entry, and restored on
• Dynamic reprioritizing 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.