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__delay_cycles() and power consumption

k1mgy
Expert 1680 points

I currently (but not for long) use __delay_cycles() to produce time delays.  During __delay_cycles(), measuring current, I go from 620 microamps to at least twice this value during __delay_cycles().  

Is this expected behaviour?

I thought simply stepping through processor cycles would not be so costly.

  • 0
    Guru 58965 points

    From current consumption point of view, executing  __delay_cycles() is the same as running other code that does not involve clock, pin, and other peripherals. The power consumed by running the CPU is almost proportional to the MCLK frequency used. 

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