Thanks guys, I implemented all the changes you suggested, and, of course, it 
worked perfectly. Curious as to what the problem was, I tried undoing the 
changes I made one at a time.

it ended up being, of all things, the mclr... argh! This had had me stuck 
for weeks! (I never really thought about the mclr floating, as the 12f509's 
I usually work with have never needed it)

btw, about the oscillator being in xt mode, if I remember correctly, that 
only effects the drive current, which, since I'm using a powered oscillator, 
is irrelevant.

Thanks again,

Drew Pilcher


>From: <jamesp@intertex.net>
>Reply-To: "Microcontroller discussion list - Public." <piclist@mit.edu>
>To: piclist@mit.edu
>Subject: Re: [PIC] Unable to get a 16f57 running,
>Date: Tue, 19 Jun 2007 08:13:41 +0500 (CDT)
>
>
>  Drew,
>
>For 19.96 Mhz you need to set the oscillator to HS mode.
>
>
>                                        Regards,
>
>                                          Jim
>
>
> > I'm currently trying to port some POV software I wrote a while ago to a
> >  16f57, but am unable to get it to function in any way. I currently
> > have the  pic (which is in a slim 28 pin DIP package) connected to a
> > 4.5v (metered at  6) wall wart power supply via pins 2 and 4 (vdd,vss),
> > and to a dip14 19.96  MHz oscillator via pin 27(clkin).
> >
> > The 57's currenty flashed with a program that does nothing but send all
> > I/O  pins high (see bottom), but won't even do that.
> >
> > The oscillator is in XT mode, with neither the WDT or code-protect
> > enabled,  the oscillator is functional (I borrowed a scope to make
> > sure), the code is  both extremely simple, and compiles with no errors
> > or warnings from MPASM,  and the programmer (a JDM) writes and verifies
> > the code successfully, yet  the pic appears to be doing absolutely
> > nothing. Also, I've tried another  16f57, but got the same results...
> >
> > The current test code is as follows (though other code has been tested
> > unsuccessfully as well)
> >
> > 	list	p=16F57		;
> > 	include "p16F5x.inc"	;
> >
> > 	__CONFIG   _CP_OFF & _WDT_OFF & _XT_OSC
> >
> >
> >        	org	h'0'		;
> >
> > 	movlw	b'00000000'	;
> > 	tris	porta		;
> > 	tris	portb		;
> > 	tris	portc		;
> >
> > 	movlw	b'11111111'	;
> > 	movwf	porta		;
> > 	movwf	portb		;
> > 	movwf	portc		;
> >
> > 		END		;
> >
> > any idea what the problem may be, or what I might try next?
> >
> > Thanks for your help,
> >
> > Drew Pilcher
> >
> > _________________________________________________________________
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