RE: about MPC555 PCB
Dobbin Allan-r11834 <[email protected]>
| Newsgroups | gmane.comp.hardware.motorola.microcontrollers |
|---|---|
| Message-ID | <45E41B46B1F8D81183E4000F20D7C40B0B5685F4@az33exm40-bu.am.freescale.net> |
In mail bekow, I meant to say reprogram shadow keeping DBPC at '0'. For DBGC, try 00 or 10. Regards, Allan -----Original Message----- From: Dobbin Allan-r11834 Sent: Wednesday, August 10, 2005 10:35 AM To: '[email protected]' Subject: RE: [MPC500] about MPC555 PCB Assuming you clocks, power and reset is/were correct, I suspect you've programmed the reset config word in shadow. In particular, the DBPC and DBGC bits may have been inadvertantly set to '1'. Assuming you have a pull-up on RSTCONF, pull it LOW at power-on reset (i.e. short it to GND or through a 100ohm resistor). Hopefully you will now have your BDM connection back. Now erase block 0 including the shadow row, reprogram your block 0 and then reprogram the shadow row keeping DBOC '1'. Let me know if this works. Regards, Allan -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of wupegasus Sent: Wednesday, August 10, 2005 8:31 AM To: [email protected] Subject: [MPC500] about MPC555 PCB Here I meet some problems about the MPC555 PCB design. My software tools is Visonclik 7.0 and my question is that: The board can go into the ¡°BDM¡° mode and I still can program the internal flash, but after that, it would't works at all. Now two weeks have passed, I still can not find the problem. So, here I would appreciate much if someone can give me some hints about this. By the way, how can i attach my SCH file and its corresponding PCB? I think maybe some one can find my faults in these. thanks! ------------------------ Yahoo! Groups Sponsor --------------------~--> <font face=arial size=-1><a href="http://us.ard.yahoo.com/SIG=12hgmsp2n/M=362329.6886308.7839368.1510227/D=groups/S=1706554205:TM/Y=YAHOO/EXP=1123717455/A=2894321/R=0/SIG=11dvsfulr/*http://youthnoise.com/page.php?page_id=1992 ">Fair play? Video games influencing politics. Click and talk back!</a>.</font> --------------------------------------------------------------------~-> ----------------------------------------------------------- To learn more about Freescale Microcontrollers, please visit http://www.freescale.com/mcu Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/MPC500/ <*> To unsubscribe from this group, send an email to: [email protected] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/