12C671 - GP3 problem

[financecatalyst]

I tried one method in which I gave continues supply to the PIC for 5v. All pins work fine as expected (Active Low).
The problem of GP3 only strikes when circuit gets power only when button is pressed and pin is made low.

[malc-c]

Not sure about the 12C chip, but on 12F series GPIO3 is the MCLR pin and what could be happening is by grounding this you are resetting the PIC - there is a way of disabling the reset function on the 12F series, so you might need to do the same on the 12C chip

[financecatalyst]

Not sure about the 12C chip, but on 12F series GPIO3 is the MCLR pin and what could be happening is by grounding this you are resetting the PIC - there is a way of disabling the reset function on the 12F series, so you might need to do the same on the 12C chip

Hi, I already have disabled the MCLR - (in Config). I also mentioned in the post above that PIC works fine when 5V supply is continues. Thanks

[mackrackit]

PIC works fine when 5V supply is continues.

What exactly do you mean?

[financecatalyst]

When I put 5V continues supply i.e. system already gets +ve & -Ve 5V and does not depend on button press for -Ve. Then lowering GP3 does result in serout data.

In other words, pic gets its 5V continues and all pins pulled high with 10K. Lowering any pin results in serout data.

[malc-c]

i.e. system already gets +ve & -Ve 5V and does not depend on button press for -Ve.

Are you applying 10V across the supply pins ? - I thought most pics will only work on 5V (ie +5v and 0V supply lines)

[financecatalyst]

No, it is 5V only. i.e. +5V & 0V.