SAM3S ATMEL [ATMEL Corporation], SAM3S Datasheet - Page 39

• Manufacturer Part Number: SAM3S
• Description: ARM-based Flash MCU
• Manufacturer: ATMEL [ATMEL Corporation]

Figure 10-3. SAM3S Power Management Controller Block Diagram
10.7
10.8
10.9
6500CS–ATARM–24-Jan-11
Watchdog Timer
SysTick Timer
Real Time Timer
MAINCK
PLLACK
PLLBCK
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).
• 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
SLCK
– 32-bit free-running back-up counter
– Integrates a 16-bit programmable prescaler running on slow clock
Master Clock Controller
MAINCK
PLLBCK
PLLBCK
PLLACK
SLCK
/1,/2,/4,...,/64
Prescaler
Programmable Clock Controller
USB Clock Controller
/1,/2,/4,...,/64
Prescaler
Sleep Mode
ON/OFF
Clock Controller
Processor
Controller
ON/OFF
Divider
Clock
Peripherals
ON/OFF
/8
HCK
int
SystTick
FCLK
MCK
periph_clk[..]
pck[..]
UDPCK
SAM3S Summary
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