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AT91SAM9G20-CU View Datasheet(PDF) - Atmel Corporation

Part Name
Description
Manufacturer
AT91SAM9G20-CU
Atmel
Atmel Corporation 
AT91SAM9G20-CU Datasheet PDF : 42 Pages
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AT91SAM9G20 Summary
Figure 9-3. AT91SAM9G20 Power Management Controller Block Diagram
Divider
/1,/2
SLCK
MAINCK
PLLACK
PLLBCK
Master Clock Controller
Prescaler
/1,/2,/4,.../64
Divider
/1,/2,/4,/6
Processor
Clock
PCK
Controller
int
Idle Mode
Peripherals
Clock Controller
MCK
periph_clk[..]
ON/OFF
Programmable Clock Controller
SLCK
MAINCK
PLLACK
PLLBCK
ON/OFF
Prescaler
/1,/2,/4,...,/64
PLLBCK
USB Clock Controller
Divider
/1,/2,/4
ON/OFF
pck[..]
UDPCK
9.6 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®/Windows CE® compliant tick generator
9.7 Watchdog Timer
• 16-bit key-protected only-once-Programmable Counter
• Windowed, prevents the processor being in a dead-lock on the watchdog access
9.8 Real-time Timer
• 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 Shutdown
Controller
9.9 General-purpose Back-up Registers
• Four 32-bit backup general-purpose registers
9.10
Advanced Interrupt Controller
• Controls the interrupt lines (nIRQ and nFIQ) of the ARM Processor
• Thirty-two individually maskable and vectored interrupt sources
27
6384CS–ATARM–11-Mar-09

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