problem in working of pic1f4550 controller.

[abhishekdixit]

hi,
i have made a project in pic18f4550 micro controller, but when i program my controller, its working ok until and unless its power is on, but when i off the power supply then again start the controller, it does not work properly. i am unable to understand that why is it happening? if anyone knows about it, then please help me.

Regards,
Abhishek Dixit

 

[tpetar]

What configuration bits did you use? try to enable "Power-On Timer".

What source for power supply did you use, some cheap SMPS ?



Best regards,
Peter

 

[jayanth.devarayanadurga]

Zip and post code and circuit when you ask question(s).

 

[abhishekdixit]

hii peter,
yes i have enable Power on timer, an i am using 12 V adapter with 7805 voltage regulator. by using regular i am giving 5V supply to regulator.


Regards,
Abhishek Dixit

 

[tpetar]

How you connect reset/MCLR pin ? Did you use 4,7K/10K resistor between MCLR and VDD ?

Did you use capacitors before and after 7805 regulator ?

If you dont have put one 100nF capacitor close as possible between VDD and VSS.




Best regards,
Peter