sam3s16 ATMEL Corporation, sam3s16 Datasheet - Page 34

• Manufacturer Part Number: sam3s16
• Description: At91sam Arm-based Flash Mcu
• Manufacturer: ATMEL Corporation

10.7
10.8
10.9
10.10 Real Time Clock
10.11 General Purpose Backup Registers
10.12 Nested Vectored Interrupt Controller
34
Watchdog Timer
SysTick Timer
Real Time Timer
SAM3S16 Preliminary
The SysTick calibration value is fixed at 12,500 which allows the generation of a time base of
1 ms with SystTick clock at 12.5 MHz (max HCLK/8 = 100 MHz/8).
• 16-bit key-protected only-once-Programmable Counter
• Windowed, prevents the processor to be in a dead-lock on the watchdog access.
• 24-bit down counter
• Self-reload capability
• Flexible System timer
• Real Time Timer, allowing backup of time with different accuracies
• 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
• Eight 32-bit general-purpose backup registers
• Thirty maskable external interrupts
• Sixteen priority levels
• Processor state automatically saved on interrupt entry, and restored on
• Dynamic reprioritization of interrupts
• Priority grouping.
• Support for tail-chaining and late arrival of interrupts.
• Processor state automatically saved on interrupt entry, and restored on interrupt exit, with no
instruction overhead.
– 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
– selection of preempting interrupt levels and non-preempting interrupt levels.
– back-to-back interrupt processing without the overhead of state saving and
Controller
restoration between interrupts.
11117AS–ATARM–12-Jul-11