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Strainge behaviour of PCF 8583 RTC.

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sn_burki

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I have made a gaint digital LED clock based on 89S52 assembly, every thing is working perfectly but I dont know why the time is running very fast in RTC. Just in 42 seconds it completes one minute. Although I m using RTC in correct order. Same circuit when I check on vera (project) board it works fine with no problem? I have checked the Crystal and change it with new one but yet the prblem exists.

Secondly I want to ask that how can I use the watchdog function in 89S52? I have not used this function before,

plz help.

regards
 

It seems to point to a layout problem. I would guess that there is noise pickup somewhere that is generating extra timing pulses
 

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