Frequency counter Oscillator schematic

  
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The oscillator provides a 1MHz and a 1khz clock. The 1MHz clock is used as the clock for the microcontroller and as timebase for millisecond measurement. I use a 2MHz and divide it by 2 in order to guarantee a 50% duty cycle. Then three halve HC390 are used as divider by 1000 which can be externally reset. This is necessary to make sure the millis
Frequency counter Oscillator schematic - schematic

econd timer starts running at the time it is needed. AC04 are used as drivers/buffers. J1 allows the use of an external clock.



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