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[PIC] Compensation circuit for Digital Clock using PIC16f877a

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MBT_1992

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I am making a project of digital clock and i am asked to provide a compensation circuit in my report. if any of the crystals connected to PIC16F877a and DS1307 fail. what will be its replacement. Can you please help me with my problem? I added the schematic of the circuit.
 

if any of the crystals connected to PIC16F877a and DS1307 fail. what will be its replacement.
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The crystals used in the microcontroller are stable and unlikely to fail for a long duration of time.Still,if you see any sign that clock signals are off-track,then either replace the faulty crystal with a new one on the PCB or get a brownout protection circuit on the digital clock for extra safety.
 
I used high precision TCXO oscillator in my frequencymeter and used a ttl prescaler for generating timebase.
Like this:

**broken link removed**

See accuracy in the datasheet. Or try another manufacturer.
 
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