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List the low power features in cortex M3.

Subject : Embedded Systems Design

Topic : Embedded Hardware and Design

Difficulty level : Medium

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  • Cortex CPU has sleep mode i.e it places core into its power mode where it halts execution of instruction with cortex CPU.
  • A small part of CPU is kept awake so that peripheral interrupts can wake up cortex Core.
  • The instruction WFI (wait for interrupt) or WFE (wait for event) is executed to place cortex core into sleep mode.
  • WFI instruction: Core will resume execution and serve pending instruction. It allows low power application to be completely interrupt driven so that core wake up run the code and re-enter into sleep mode.
  • WFE instruction: It allows the cortex Core to resume execution from the point where it was placed into sleep mode.
  • WFI & WFE are called using macros.
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