Hardware problem or what ?

[J. Mark Wolf]

It sounds like your power suppy is "sagging" when you release the switch, because the cap on the PortD.1 is charging, and drawing current from either your MCLR circuit or your power supply.

Add some 10uF caps across the bypass caps on your PIC power pins and the problem should go away.

I learned years ago to use DS1233 reset generator chips on my MCLR pin to solve little issues like this. Never had a problem since.

[sougata]

Hi,

It all seems so strange. It is really difficult to comment without having the schematics and the code handy. If you are using Brownout reset enabled then you can try disabling it. If that solves the problem then there is something wrong with your PS. Also take care that all your VDD/VSS pins (11/12<->32/31) are hardwared. Although they are internally connected you cannot give power to one and draw out from the other.

[Steve S.]

Thanks to all,

i will try monitoring the power line and MCLR to see if something strange will appear also if without the cap seems to work fine and seem also to be insensitive to noise.

about PIC programming.... oscillator XT all aother flags OFF.

This week the hardware and firmware will be extensively tested
on a induction welding machine in a very electrically noisy environment

AC and DC line will be monitorized...

When the gremlins will be found i will post his head in the forum!









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