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'[PIC]: Power off and on quicly'
2001\01\30@032423 by Nuri ERGINER

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hi,
Every thing ok with my 16f84 except one problem.

When I turn off and on the power quicly the pic can not reset it self. What
can I do to solve this problem.
It needs more then 1 sec to reset it self

Regards,
Nuri Erginer

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2001\01\30@033009 by Douglas Wood

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It sounds like your power supply isn't dropping off fast enough. You might
try putting a microprocessor supervisor chip in your circuit.

Douglas Wood
Software Engineer
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Home of the EPICIS Development System for the PIC and SX

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{Original Message removed}

2001\01\30@035859 by JP.BROWN

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Nuri you could try using the reset circuit shown in the data sheet (the
one with 2 resistors, a cap and a diode), it worked well for me.
------ John

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> {Original Message removed}

2001\01\30@053359 by dre Domingos F. Souza

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>When I turn off and on the power quicly the pic can not reset it self. What
>can I do to solve this problem.
>It needs more then 1 sec to reset it self

       A little tip: Don't switch the PSU, switch the output of the PSU. It's a cheap trick, but saved me lot's of times. I use a PC PSU for powering my projects. And the rise/fall time of the outputs is SO slow that the pic gets crazy trying to reset itself.


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       All the best!!!
       Alexandre Souza
       .....xandinhoKILLspamspam.....interlink.com.br
       Linux User #85093

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2001\01\30@071151 by Anand Dhuru

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Nuri, I faced the same problem; connecting a 1K resistor between Vcc and
ground to bleed the power fast when switched off worked great.

Regards,

Anand.
{Original Message removed}

2001\01\30@131239 by Bob

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Um, I believe the MCLR (RA4) pin might come in handy for that, if your just
wanting to reset the uP.  Just use a button or switch tied between RA4 and
ground, it will reset immediately.


{Original Message removed}


'[PIC]: Power off and on quicly'
2001\02\01@161316 by Peter L. Peres
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One of the reasons is not the speed but the value of the PSU when switched
off. This needs to go low enough to engage the reset latch in the pic. One
way to do this is to add a 1K resistor directly in parallel with the pic
power pins. It will draw 5mA when power is present, but when it is turned
off, it will pull the supply low enough to reset the pic. This may save
your design as is (if you already have the boards etc).

Peter

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