Is there a way to do this using another logic chip to control the reset
or a transistor? I need to control this reset from another signal on my
circuit. I posted a message about this to the [EE] board didn't think it
was appropriate for this board. What I have from this point which is an
inappropriate signal to work with is a rectified dc signal that as logic
high is 41v dc and logic low is 14v dc. Somehow I need that 14v dc to
reset the processor? I need my program to reset at this condition and
I'm out of I/O pins on the processor to deal with this.

Regards,
Steve

-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU] On Behalf Of Jinx
Sent: Monday, February 04, 2002 9:16 PM
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [PIC]:16f84 Question

> On a 16f84, if I bring Mclr to ground will this reset the chip?

Yes, but you risk damage to the chip if you ground it directly

> > 220 ohm current limiting resistor from MCLR first of all

> > From the free end of the 220R -

> > 10k to Vcc

> > Button + 100R to 0V

> > 10nF to 0V (ie in parallel with the button and the 100R)

> > The 10nF + 10k to Vcc provides some noise filtering and
> > also ensures that MCLR stays low for a short time after
> > Vcc goes high at power-up

> > You can also add a small diode in parallel with the 10k, with
> > the cathode (stripe end) to Vcc. This is a discharge path for
> > the 10nF at power-down

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