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How to Give Hour delay in 851

hi..
am having an old Refrigerator.
Itz continuously working , causes heavy current charge
i wish to construct a timer circuitry for cut off the above device
am using 8051 micro controller .. I wish to use P1.7 as energizing pin.

i wish to give half an hour cut off after every 2 hours of operation.

so.. help me to create the code ..
thanks..

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