Shawn Wilton wrote:
> On 9/29/06, Bob Axtell <engineer@neomailbox.com> wrote:
>   
>>
>> Yes, I just programmed 4 of them last night. Works good. But only in
>> programmer mode, not ICD2 mode;
>> the PIC12F675/629 both do not have the internal debugger..
>>     
>
>
> How do you use the debug header?  Am I supposed to hook up the header in
> place of the 8 pins on my IC?  Hardly convenient when I have a finished
> board if that's the case.
>
>   
I've never used those things. I don't know how they hook up. I embed a 
morse code beeper as a debug
tool in the PIC12F675, and I have it do a memory dump out an unused (or 
temporariily assigned) pin.
So for those PICs that won't hook up to the ICD2, I use the morse code 
beeper. I keep a pad of paper
handy to capture the dump.

Last shot. Maybe MPLAB7.42 has reverted to bad ICD2 code again? Can you 
temporarily try MPLAB7.40
just for verification?

--Bob
 
>   
>> Well, have you tried powering the device thru the external 9V access on
>> the ICD2. Perhaps you are not
>> properly powering it.. What do the self-tests say? Do they pass?
>>     
>
>
> Yes, the 9V adapter is plugged in to the  ICD and all the self-tests pass
> just fine.
>
> Look for a GND loop between the development PC and the product. I have
>   
>> seen AC GND problems make
>> the ICD2 act like it lost its mind. The problem is usually caused by the
>> PC itself. At least, make sure
>> they both operate from the SAME AC mains branch. Course, an AC loop
>> might destroy the drivers in the
>> ICD2 as well.
>>     
>
>
> There is no ground loop.  Only thing with AC power is the ICD.  The target
> board is hardwired to a Li-Ion battery.
>
> Sounds like you may have broken it. There are a couple of TSSOP driver
>   
>> chips that break a lot, I am told
>> (74HC125 & 74HC126). Sorry.
>>     
>
>
> Works just fine with my PICDEM2+ board.  But doesn't work worth **** with
> these 12F675s.
>
> I have this ICD in my possession.  Just can't figure out why it won't work.
> Won't recognize the chip.  Just returns either a 0x000 or a 0x1FF or
> something like that.  Can't remember and can't always duplicate it.
>
>   

-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist