AT91 Power Management

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AT91 Power Management
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Power Management Options

• The ARM7TDMI processor is industry leader in
  MIPS/Watt
• The AT91 microcontroller embeds controller to
  provide advanced power management
• Power Saving (PS) controller
• AT91x40 Family
• Power Management Controller (PMC)
• AT91M63200, AT91M42800A
• Advanced Power Management Controller (APMC)
• AT91M55800A

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PS Features

• Optimizes the power consumption of the device
• Controls the CPU and Peripheral clocks
• Stop the CPU clock and enter Idle Mode
• The ARM Core Clock is disabled and waiting for
  the next interrupt
• The peripheral clocks are enabled and the PDC
  transfers are still possible.
• Enables and disables the peripheral clocks
  individually

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PMC Features

• Optimizes the power consumption of the device
• Controls the clocking elements
• Oscillator and PLLs
• System and Peripheral clocks
• Three operating modes
• Normal mode
• Idle mode
• The ARM Core Clock is disabled and waiting for
  the next interrupt
• The peripheral clocks are enabled and the PDC
  transfers are still possible
• Slow clock mode
• The device core and peripheral run in Slow Clock
  Mode

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PMC Block Diagram
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APMC Features (1/2)

• Optimizes power consumption of the device and the
  complete system
• Controls the clocking elements
• Oscillators
• PLL
• Core clock
• Peripheral clocks
• Controls the system power supply

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APMC Features (2/2)

• Five operating modes
• Normal mode
• The ARM core clock is enabled
• Used peripheral clocks are enabled
• Idle mode
• The ARM Core Clock is disabled and waiting for
  the next interrupt
• The peripheral clocks are enabled and the PDC
  transfers are still possible
• Slow clock mode
• The device core and peripherals run in Slow Clock
  Mode
• Standby mode
• Combination of Slow clock and Idle mode, very low
  power consumption
• Power down mode
• Main power supply is turned off until a
  programmable edge on the wake-up signal or a
  programmable RTC Alarm occurs

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APMC Block Diagram