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1745D–ATARM–04-Nov-05
AT91M55800A
12.1 Operating Modes
Five operating modes are supported by the APMC and offer different power consumption lev-
els and event response latency times.
•Normal Mode:
The Main Power supply is switched on; the ARM Core Clock is enabled and the peripheral
clocks are enabled according to the application requirements.
• Idle Mode:
The Main Power is switched on; the ARM Core Clock is disabled and waiting for the next
interrupt (or a main reset); the peripheral clocks are enabled according to the application
requirements and the PDC transfers are still possible.
• Slow Clock Mode:
Similar to Normal Mode, but the Main Oscillator and the PLL are switched off to save
power; the device core and peripheral run in Slow Clock Mode; Note that Slow Clock
Mode is the mode selected after the reset.
• Standby Mode:
A combination of the Slow Clock Mode and the Idle Mode, which enables the processor to
respond quickly to a wake-up event by keeping very low power consumption.
• Power-down Mode:
The Main Power supply is turned off at the external power source until a programmable
edge on the wake-up signal or a programmable RTC Alarm occurs.