AT32UC3L064_1 ATMEL [ATMEL Corporation], AT32UC3L064_1 Datasheet - Page 163

• Manufacturer Part Number: AT32UC3L064_1
• Description: AVR32 32-bit Microcontroller
• Manufacturer: ATMEL [ATMEL Corporation]

13.6.8
32099A–AVR32–06/09
Interrupts
As soon as the detector is enabled, the clock failure detector will monitor the divided main clock.
Note that the detector does not monitor if the RCSYS is the source of the main clock, or if the
main clock is temporarily not available (startup-time after a wake-up, switching timing etc.), or in
sleep mode where the main clock is driven by the RCSYS (Stop and DeepStop mode). When a
clock failure is detected, the main clock automatically switches to the RCSYS clock and the CFD
interrupt is generated if enabled.
The MCCTRL register that selects the source clock of the main clock is changed by hardware to
indicate that the main clock comes from RCSYS.
The PM has a number of interrupts:
• AE: Access Error, set if a lock protected register is written without first beeing unlocked.
• CKRDY: Clock Ready, set when new CKSEL setings are effective.
• CFD: Clock Failure Detected, set if the system detects that the main clock is not running.
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