RE: PORESET and SWT

I have a revised problem.
 
At POR the PORESET is a sserted by the power supply (MC33998) ~22ms.  
HRESET in negated
SRESET is negated
 
ENGCLK (i didn't run CLKOUT from under the device) starts at 312.5kHz
(or 20MHz/64) and then ~7s  later HRESET is asserted by the MPC566 and
the device restarts and function correctly.  I can't find a reason for
the problem.
 
Thanks
 
Peter Allen
Haltech Design Engineer
www.haltech.com <http://www.haltech.com/> 
ph:  95252400
fax: 95252991
 
 
 

-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf
Of Dobbin Allan-r11834
Sent: Tuesday, 26 July 2005 11:29 PM
To: '[email protected]'
Subject: RE: [MPC500] PORESET and SWT


On the Axiom board, it sounds liekt he POR time is not long enough, but
I would have suspected that h/w to be correct.  Your other h/w is a bit
of a mystery i.e. why the PIT wouldn't work but other clocks would.  Is
it possible the wrong clock source has been selected for the timer?  As
far as guessing your sysclk speed - look at the CLKOUT signal.

Allan


-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf
Of Peter Allen \(Yahoo\)
Sent: Monday, July 25, 2005 8:49 PM
To: [email protected]
Subject: [MPC500] PORESET and SWT


I just got some hardware back and can get code into flash.  The device
comes out of reset but doesn't boot withou BDM intervention (ie.  I
attach to code already on target and then use the reset command and the
code starts running as expected).  I have also noticed that the PIT
doesn't always start working but serial coms and TPU run ok and the SWT
doesn't ever time out to cause a reset.

Things I know (I think):

device is operating at desired 56MHz since:
     baud rate is tied to this.
    TPU functions are producing the correct timing patterns.

I noticed that on my Axiom eval board when i used the POReset the code
would not boot until the watchdog timer ran out and and then everything
would work OK.  I I used the Hreset or Sreset the system would bot
straight away (power is applied to the board at all times).

If anyone has some wisdom on this problem I would greatly appreciate the
help

Peter Allen
Haltech Design Engineer
www.haltech.com <http://www.haltech.com/> 
ph:  95252400
fax: 95252991



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