AT91SAM9261S-CJ ATMEL [ATMEL Corporation], AT91SAM9261S-CJ Datasheet - Page 22

• Manufacturer Part Number: AT91SAM9261S-CJ
• Description: AT91 ARM Thumb-based Microcontrollers
• Manufacturer: ATMEL [ATMEL Corporation]

9.6
9.7
9.8
9.9
22
Power Management Controller
Periodic Interval Timer
Watchdog Timer
Real-time Timer
AT91SAM9261S
Figure 9-3.
• The Power Management Controller provides:
• Includes a 20-bit Periodic Counter with less than 1 µs accuracy
• Includes a 12-bit Interval Overlay Counter
• Real time OS or Linux
• 12-bit key-protected only-once programmable counter
• Windowed, prevents the processor to be in a dead-lock on the watchdog access
• 32-bit Free-running backup counter
• Alarm Register capable to generate a wake-up of the system
– the Processor Clock PCK
– the Master Clock MCK
– the USB Clock USBCK (HCK0)
– the LCD Controller Clock LCDCK (HCK1)
– up to thirty peripheral clocks
– four programmable clock outputs: PCK0 to PCK3
PLLBCK
MAINCK
PLLACK
SLCK
Power Management Controller Block Diagram
Master Clock Controller
/1,/2,/4,...,/64
®
Prescaler
/WindowsCE
MAINCK
PLLACK
PLLBCK
SLCK
PLLBCK
Programmable Clock Controller
®
/1,/2,/3,/4
Divider
compliant tick generator
USB Clock Controller
/1,/2,/4,...,/64
Prescaler
ON/OFF
Divider
/1,/2,/4
APB Peripherals
AHB Peripherals
Clock Controller
Clock Controller
Processor
Controller
Idle Mode
Clock
ON/OFF
ON/OFF
PCK
int
MCK
periph_clk[2..21]
HCKx
pck[0..3]
usb_suspend
UDPCK
UHPCK
6242DS–ATARM–06-Jan-09