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How to remember the number of power switch

g jamen

How to remember the number of power switch,
Note:the power is main power,if the power off time is too long,MCU was stop working. sod ,off time less then 400ms,and MCU have a big cap to save power.
question:
if on/off power switch 1 times MCU output 500Hz on/off power switch 2 times MCU output 1000Hz ....................................
anyone have a method?
thx you .

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