Datasheet

32
6289CS–ATARM–28-May-09
AT91SAM9R64/RL64
• Standby Mode, mix of Idle and Backup Mode, peripheral running at low frequency, processor
stopped waiting for an interrupt
• Backup Mode, Main Power Supplies off, VDDBU powered by a battery
Figure 9-3. AT91SAM9R64/RL64 Power Management Controller Block Diagram
9.8 Periodic Interval Timer
• Includes a 20-bit Periodic Counter, with less than 1 µs accuracy
• Includes a 12-bit Interval Overlay Counter
• Real Time OS or Linux
®
/WindowsCE
®
compliant tick generator
9.9 Watchdog Timer
• 16-bit key-protected only-once-Programmable Counter
• Windowed, prevents the processor to be in a dead-lock on the watchdog access
9.10 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 through the Shut Down
Controller
9.11 Real-Time Clock
• Low power consumption
• Full asynchronous design
MCK
periph_clk[..]
int
SLCK
MAINCK
PLLCK
Prescaler
/1,/2,/4,...,/64
PCK
Processor
Clock
Controller
Idle Mode
Master Clock Controller
Peripherals
Clock Controller
ON/OFF
SLCK
MAINCK
PLLCK
Prescaler
/1,/2,/4,...,/64
Programmable Clock Controller
pck[..]
ON/OFF