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adc creats garbage in lcd

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anzilkhan

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I am using pic 18f452 to develop my product with ccsc compiler. It consists of lcd, keyboard, serial port etc.... Every thing works fine except, my lcd shows only garbage when adc is given input before giving power to pic. the problem is not solved even though my code contains a no of "clear lcd" command in the run time. but it works absolutely fine if adc inputs are given after powering pic.I have some how managed to avoid the problem by turning off adc n providing some delays and all.But i would like to know what exactly the problem is? n what exactly i should do to avoid it.
 

Would you like to tell some detail of what are u connecting at the adc input ..like some external analog sensor or what..and how do you manage to apply signal to adc input without powering up pic...are u using two different power sources ??
 

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