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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