ATSAM3U datasheet(41/62 Pages) ATMEL

41 / 62 page

6430CS–ATARM–09-Apr-10

SAM3U Series

10.7

Watchdog Timer

• 16-bit key-protected once-only Programmable Counter

• Windowed, prevents the processor to be in a dead-lock on the watchdog access

10.8

SysTick Timer

• 24-bit down counter

• Self-reload capability

• Flexible system timer

10.9

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

10.10 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

10.11 General-Purpose Back-up Registers

• Eight 32-bit general-purpose backup registers

10.12 Nested Vectored Interrupt Controller

• Thirty maskable interrupts

• Sixteen priority levels

• Dynamic reprioritization of interrupts

• Priority grouping

– selection of preempting interrupt levels and non preempting 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.

ATSAM3U Datasheet(PDF) 41 Page - ATMEL Corporation