Re: sreset and hreset in mpc565.

I now have disconnected my reset-cirquit and when i connect POWER ON
RESET to ground and disconnect it, it changes (CLKOUT) from 11mhz to
20mhz, the last one is the correct. MODCLK are all correct. XTAL is
also fine. So I believe that probably the reset-cirqiut is broken. I
should control the behaivor when disconnecting that on other cards, to
be real sure. Thanks for the help.

//Daniel


--- In [email protected], Dobbin Allan-r11834 <Allan.Dobbin@f...>
wrote:
> As David says, first thing to check is the clock.  Look at CLKOUT
and if necessary, your xtal input and MODCLK settings.  The BDM port
also drives these signals so make sure that is not the cause i.e.
disconnect the wiggler and ensure nothing is shorted onto HRESET.
> 
> Regards,
> Allan
> 
> -----Original Message-----
> From: [email protected] [mailto:[email protected]] On
Behalf Of David Brown
> Sent: Wednesday, July 20, 2005 8:18 AM
> To: [email protected]
> Subject: Re: [MPC500] sreset and hreset in mpc565.
> 
> 
> > Hi!
> > Im haveing some problem on one of 4 in-development-mpc565-using-cards.
> >
> > The problem is that they should be all identical, but on one card 
> > sreset and hreset are 0v. On all others sreset and hreset are 5v, 
> > since of the pullup resistor.
> >
> > Now i just wonder if that indicates that the processor is broke,
or if 
> > there are other pins that could cause this error? For example the 
> > POWER ON RESET pin is correct, same as on fully working cards.
> >
> > Since there has been certain modifications done, it is possible that 
> > they are not fully identical, though they should. If someone could 
> > give me a clue about it, i woud really appreciate that.
> >
> > //Daniel
> >
> >
> 
> The mpc565 can drive the HReset and SReset signals itself.  When it
sees a
> (low) POReset signal, it will drive HReset and SReset low for a
while.  It first releases HReset, after certain basic functions are in
order (I can't remember exactly, but at least the clock should be up
and running, and the databus sample for reset configuration if you are
using that).  After a brief delay, SReset will then be released.
> 
> If your POReset signal is high, then it seems your processor is
keeping the HReset (and therefore SReset) low for some reason.  The
most likely guess is that it has not managed to get the clock running
properly.
> 
> 
> 
> 
> -----------------------------------------------------------
> To learn more about Freescale Microcontrollers, please visit
http://www.freescale.com/mcu
> 
> 
>  
> Yahoo! Groups Links




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