I've gotten this chip to run OK at 20mHz with a generic Digikey
resonator.  Make sure you have your oscillator configured correctly.

Can you single step the code?...Try setting breakpoints...What appears
in the watch windows as you move through...

I've had some functional problems when I pick the wrong oscillator type,
looks like it programs but then the other tests fail...
Try that, it's easy and direct...


DD

On Sun, 2004-02-15 at 07:16, No Religion wrote:
> Hi all,
> I'm really losing my mind now, been fighting with this for 8 days
> now, I give up. I hope you can tell me what's wrong in my setup. :(
>
> I self made a PIC18F8720 development board, and it seems to work,
> because I can program the chip with no problems.
>
> I'm using 100 nF SMD capacitors near every Vdd (including AVdd),
> and an integrated clock oscillator. It's a 24 MHz CMOS part by
> Epson.
>
> I wrote a simple test program which is supposed to set all ports
> to output (via the TRISx registers), and then put all of them to
> the "HIGH" logic level (via the PORTx registers).
>
> This is my code, as shown by IC-Prog:
> 0000: D00F 0000 0000 0000 0000 0000 0000 0000
> 0008: 0000 0000 0000 0000 0000 0000 0000 0000
> 0010: 0000 0E00 6E92 6E93 6E94 6E95 6E96 6E97
> 0018: 6E98 6E99 6E9A 0000 0000 0000 0000 0000
> 0020: 0EFF 6E80 6E81 6E82 6E83 6E84 6E85 6E86
> 0028: 6E87 6E88 0000 0000 0000 0000 0000 0000
> 0030: D7DE 0000 0000 0000 0000 0000 0000 0000
>
> And this is the configuration:
> Config1  = 2500
> Config2  = 000F
> Config3  = 0080
> Config4  = 0081
> Config5  = C0FF
> Config6  = E0FF
> Config7  = 40FF
> ID Value = 0123456789ABCDEF
>
> Is there anything wrong in my machine code (for this quick test
> I don't want to nor I think I need to install MP-Lab.. I tried
> it and hated it, I will write my own source level debugger and
> assembler and release it to the PD after I'm finished).
>
> Is the reset vector ok? It's supposed to be a BRA to 0010, where
> it will meet a NOP (no reason in particular) and then the value
> 00 will be moved to W, which in turn will be moved to all the
> TRISx registers. Then W will be loaded with FF, which will be
> copied to all the PORTx registers. Finally (through some NOPs,
> again, just to leave some space for inserting other code for
> experiments) there's supposed to be a final BRA back to 0010.
> Addresses don't represent bytes, but instruction words.
>
> I know it's tedious to go through machine code.. but if you're
> kind enough, and if the code or the configuration is wrong, please,
> can you point me to the errors?
>
> Or, in alternative, could some kind soul post a small .HEX file
> with a demo program that just turns some port pins ON and some
> others OFF, just to see if my problem lies in my hardware or in
> my code?
>
> I hope to get your valuable help.. I really don't know what to
> experiment else.
>
> Kindest regards,
> Mike
>
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