RE: Re: Problems programming flash on M68KIT912DP256 wit h BD M Multilink/Metrowerks | 68HC12

Hi, I believe the BDM Multilink will draw more power during Flash programming so if your power supply is close to the requirements of your target system and BDM cable combined then the programming voltage may drop too low and pull the cables processor voltage with it resulting in a BDM disconnect. You can power the cable directly with 5 volts using the center negative connector provided. Alternatively, make sure you have at least 250mA in addition to your target requirements and that should be more than sufficient to keep the programming voltage where it should be. We've seen this happen before mostly with the CABLE12HS (the predecessor to the Multilink), but it may be worth a try with the Multilink. Hope this helps. Mike -----Original Message----- From: djsimpson100 [mailto:] Sent: Monday, September 02, 2002 8:17 AM To: Subject: [68HC12] Re: Problems programming flash on M68KIT912DP256 with BD M Multilink/Metrowerks Hi, Thanks for you help. I think the problem may even be a faulty BDM Multilink. I have tried plugging it in directly to the parallel port on three different computers (with different mother boards and operating systems) and it doesn't work on any of the them when I try to program the flash. The strange thing is that is seems to work OK for RAM only code. I can download code and execute it, single step it etc if the code is in the RAM, but as soon as I try to program / access the flash via the BDM, it doesn't work, and the BDM needs a reset. I can't belive the BDM is that tempremental that it won't work on any of my computers. I have been in contact with support europe over the last two weeks , and they have suggested several things, none of which have worked. Hopefully I will have access to an other BDM tomorrow to see if the BDM is working or not. I'm getting a bit desperate, as I have code to develop which needs to be programmed into the flash, but instead seem to be stuffing around with BDM problems. David --- In 68HC12@y..., Kellogg Dave <dave.kellogg@r...> wrote: > I am also using the P&E MultiLink, but with the Cosmic tools. > > I have found that the MultiLink works best if plugged directly to the > parallel port on the PC, with no DB25 cable. Even cables marked "IEEE-1284 > compliant" are not reliable. On one day it will work, on the next it won't. > > To gain distance between the PC and the target board, I replaced the 18" > long 6-pin cable with one that I fabricated from Cat-5E cable with 6-pin > connectors on both ends. In the Cat-5E cable, there are 4 twisted pairs. I > commoned one of the lines in each pair (4 total), and connected to ground. > Of the remaining 4 lines, I used one for BGND, one for RESET, and two for > +5v. > > I have successfully (i.e., it seems to work) used a cable of this > construction that is 15 feet long. Typically we use a cable that is about 5 > feet. When I get a chance, I want to try a really long cable (50 feet?), > just to determine a threshold of confidence. > > This might not be the cause of your problems, but it might help. > > Dave.Kellogg@R... -------------------------------------------------------- To unsubscribe from this group, send an email to: To learn more about Motorola Microcontrollers, please visit http://www.motorola.com/mcu

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Discussion Groups | 68HC12 | RE: Re: Problems programming flash on M68KIT912DP256 wit h BD M Multilink/Metrowerks

RE: Re: Problems programming flash on M68KIT912DP256 wit h BD M Multilink/Metrowerks - Mike Burns - Sep 3 9:47:00 2002