AT91SAM9260-CU ATMEL [ATMEL Corporation], AT91SAM9260-CU Datasheet - Page 30

• Manufacturer Part Number: AT91SAM9260-CU
• Description: AT91 ARM Thumb Microcontrollers
• Manufacturer: ATMEL [ATMEL Corporation]

9.6
9.7
9.8
9.9
9.10
30
Periodic Interval Timer
Watchdog Timer
Real-time Timer
General-purpose Back-up Registers
Advanced Interrupt Controller
AT91SAM9260
Figure 9-3.
• Includes a 20-bit Periodic Counter, with less than 1 µs accuracy
• Includes a 12-bit Interval Overlay Counter
• Real Time OS or Linux
• 16-bit key-protected only-once-Programmable Counter
• Windowed, prevents the processor being in a dead-lock on the watchdog access
• Four 32-bit backup general-purpose registers
• Controls the interrupt lines (nIRQ and nFIQ) of the ARM Processor
• Thirty-two individually maskable and vectored interrupt sources
– Real-time Timer 32-bit free-running back-up Counter
– Integrates a 16-bit programmable prescaler running on slow clock
– Alarm Register capable of generating a wake-up of the system through the
– Source 0 is reserved for the Fast Interrupt Input (FIQ)
– Source 1 is reserved for system peripherals (PIT, RTT, PMC, DBGU, etc.)
Shutdown Controller
PLLACK
PLLBCK
MAINCK
SLCK
AT91SAM9260 Power Management Controller Block Diagram
Master Clock Controller
/1,/2,/4,...,/64
®
/Windows CE
Prescaler
MAINCK
PLLACK
PLLBCK
PLLBCK
SLCK
Programmable Clock Controller
®
Divider
/1,/2,/4
compliant tick generator
USB Clock Controller
Divider
/1,/2,/4
/1,/2,/4,...,/64
Prescaler
Clock Controller
Processor
Controller
Idle Mode
ON/OFF
ON/OFF
Clock
Peripherals
ON/OFF
6221IS–ATARM–12-Aug-08
PCK
int
MCK
periph_clk[..]
pck[..]
UDPCK
UHPCK