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'[PIC:]Re: Fried MCLR on 18f452?'
2004\06\21@060914 by Daniel Chia

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Oops, sorry bout the double post. computer being screwy.
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Daniel Chia

"Genius is one percent inspiration and ninety-nine percent perspiration."

    - Thomas Edison

E-mail: spam_OUTdanielcjhTakeThisOuTspamyahoo.com.sg
MSN: .....danstryder01KILLspamspam@spam@yahoo.com.sg
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{Original Message removed}

2004\06\21@063417 by Russell McMahon

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> > "Genius is one percent inspiration and ninety-nine percent
perspiration."
> >
> >      - Thomas Edison


FWIW, Tesla, who was insulted to receive the Edison medal, thought Edison an
idiot who used copious perspiration instead of a little thinking.

       RM

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2004\06\21@071846 by Jan-Erik Soderholm

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Daniel Chia wrote :

> > Hi,
> > I recently built my own serial programmer for the
> > 18F452 using the com84-style kind of programmer.

I don't know that programmer, and you don't specificaly
say, but it *does* support the 18F452, right  ?

> > i programmed it in IC-prog with JDM setting.
> > However, my MCLR pin is behaving strangely. Its drawing
> > about 13mA of current and if use a 4k7 to tie it high, the
> > voltage at the pin is 0.6V!
> > So right now i tie it directly high and everything appears to
> > be okay...

Appears yes, but you don't think it is okay, right ? :-) :-)

Breadboard or PCB ?
Anything else connected (intentionaly or by accident)
the MCLR ?
Tested with another 18F452 ?
What is the rest of the setup looking like ?

Jan-Erik.

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2004\06\21@080909 by Daniel Chia

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Hi,

----- Original Message -----
From: "Jan-Erik Soderholm" <jan-erik.soderholmspamKILLspamTELIA.COM>
To: <.....PICLISTKILLspamspam.....MITVMA.MIT.EDU>
Sent: Monday, June 21, 2004 19:18
Subject: Re: [PIC:]Re: Fried MCLR on 18f452?


> Daniel Chia wrote :
>
> > > Hi,
> > > I recently built my own serial programmer for the
> > > 18F452 using the com84-style kind of programmer.
>
> I don't know that programmer, and you don't specificaly
> say, but it *does* support the 18F452, right  ?
>
   The programmer is designed for a 16f877 i believe but as far as i know i
think its compatible. Don't have anymore programmed 18f8452s on hand to test
whether its the chip thats cooked..

> > > i programmed it in IC-prog with JDM setting.
> > > However, my MCLR pin is behaving strangely. Its drawing
> > > about 13mA of current and if use a 4k7 to tie it high, the
> > > voltage at the pin is 0.6V!
> > > So right now i tie it directly high and everything appears to
> > > be okay...
>
> Appears yes, but you don't think it is okay, right ? :-) :-)

Yeah, not being able to tie high the MCLR through a resistor is really
wierd... I measured the 13mA by hooking up a multimeter from Vcc to the pin.

>
> Breadboard or PCB ?

Breadboard
> Anything else connected (intentionaly or by accident)
> the MCLR ?

Theres nothign else connect to the MCLR

> Tested with another 18F452 ?
> What is the rest of the setup looking like ?

Erm i have a LM2940CT05 regulator supplying power. its connected to a
wallwart kind of adaptor giving about 7 volts.


>
> Jan-Erik.
>
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Daniel Chia

"Genius is one percent inspiration and ninety-nine percent perspiration."

    - Thomas Edison

E-mail: EraseMEdanielcjhspam_OUTspamTakeThisOuTyahoo.com.sg
MSN: danstryder01spamspam_OUTyahoo.com.sg
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