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power on reset circuit

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yingyingong

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i've design a digital clock circuit using counter, decoder and flip flop. however, i need a power on reset circuit. the circuit is to reset the time to 00 seconds everytime the button of the power on reset circuit is pressed. anyone know how to design the circuit?
 

the counters and flipflops have a 'rst' pin. apply a pulse derived from poweron , to those 'rst' pins.
 

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