Transcript Peripherals Overview

AT91 Power
Management
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
6
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
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