ATSAM3S4BA-MU datasheet(39/64 Pages) ATMEL

39 / 64 page

6500CS–ATARM–24-Jan-11

SAM3S Summary

Figure 10-3. SAM3S Power Management Controller Block Diagram

The SysTick calibration value is fixed at 8000 which allows the generation of a time base of 1 ms

with SystTick clock at 8 MHz (max HCLK/8 = 64 MHz/8).

10.7

Watchdog Timer

• 16-bit key-protected only-once-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

MCK

periph_clk[..]

int

SLCK

MAINCK

PLLACK

Prescaler

/1,/2,/4,...,/64

HCK

Processor

Clock

Controller

Sleep Mode

Master Clock Controller

Peripherals

Clock Controller

ON/OFF

USB Clock Controller

SLCK

MAINCK

PLLACK

Prescaler

/1,/2,/4,...,/64

Programmable Clock Controller

PLLBCK

pck[..]

PLLBCK

UDPCK

ON/OFF

FCLK

SystTick

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ATSAM3S4BA-MU Datasheet(PDF) 39 Page - ATMEL Corporation

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