SAM3X8E Atmel Corporation, SAM3X8E Datasheet - Page 46

• Manufacturer Part Number: SAM3X8E
• Manufacturer: Atmel Corporation

10.7
10.8
10.9
48
48
Watchdog Timer
SysTick Timer
Real Time Timer
SAM3X/A
SAM3X/A
Figure 10-3.
The SysTick calibration value is fixed at 10500, which allows the generation of a time base of
1 ms with SystTick clock to 10.5 MHz (max HCLK/8).
• 16-bit key-protected once-only 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
– 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
PLLACK
MAINCK
Power Management Controller Block Diagram
SLCK
UPLL
Master Clock Controller
MAINCK
PLLACK
HSCK
SLCK
UPLL
MCK
/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[..]
UOTGCK
11057AS–ATARM–10-Feb-12
11057AS–ATARM–10-Feb-12