AT91 Power Management

1. AT91 Power Management

2. 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

3. 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

4. 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

5. PMC : Block Diagram

6. 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

7. 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

8. APMC : Block Diagram