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Hi all, we got new MC68HC711E9CFN2 with mask 4K81H and got problems to program it. We had this problem before with a former mask but since 2years we had mask 5C47M and no problem at all. Is there somebody with the same problems? Regards Walter

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Walter: There was a thread a number of months ago concerning problems programming the 68HC711E9. It turned out that chips were being destroyed by excess current into the VPP/XIRQ pin, effective with a certain new mask. There is a PDF file called 68HC711E9MSE3.PDF which is an errata sheet for mask set H50W. You can find it on the product page on the Motorola website under 68HC711E9. The preferred workaround was to be sure that there is a 1K series resistor between the source of VPP and the XIRQ pin, to limit the current. Hope this is helpful. Best regards, Kerry Berland Silicon Engines 2101 Oxford Road Des Plaines, IL 60018 USA 847-803-6860 Fax 847-803-6870 ----- Original Message ----- From: "Walter Muth" <> To: "MotHC11" <> Sent: Friday, December 13, 2002 7:16 AM Subject: [m68HC11] New Mask for MC68HC711E9CFN2 ? > Hi all, > > we got new MC68HC711E9CFN2 with mask 4K81H and got problems to > program it. We had this problem before with a former mask but > since 2years we had mask 5C47M and no problem at all. > > Is there somebody with the same problems? > > Regards > Walter > > > To unsubscribe from this group, send an email to:

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By the way-- Motorola people-- It would be helpful to know how we could more closely tie errata sheets to mask set numbers. In the issue discussed below-- problems with VPP and XIRQ-- the published errata sheet applies to mask set H50W. Walter reports he's now using mask set 4K81H. How can a user engineer correlate that number, with reported issues on errata sheets? More specifically--taking the VPP/XIRQ issue as an example-- 1. Is there a more recent mask set, beyond H50W, which corrects this problem? 2. How does one know whether a specific mask set is later than another? Is 4K81H improved over H50W? 3. How does one find out when an issue, previously reported on an errata sheet, has been corrected by a subsequent mask set? 4. Restating (3)-- if errata sheets report the discovery and workaround for an issue, what document reports the availability of corrected parts, and states which issues have been cleared? Having said all that-- your website and errata sheets and product pages are huge improvements over what was made available a year or so ago.... Best regards, Kerry Berland Silicon Engines 2101 Oxford Road Des Plaines, IL 60018 USA 847-803-6860 Fax 847-803-6870 ----- Original Message ----- From: "Kerry Berland" <> To: <> Sent: Wednesday, December 18, 2002 4:32 PM Subject: Re: [m68HC11] New Mask for MC68HC711E9CFN2 ? > Walter: > > There was a thread a number of months ago concerning > problems programming the 68HC711E9. It turned out > that chips were being destroyed by excess current into > the VPP/XIRQ pin, effective with a certain new mask. > > There is a PDF file called 68HC711E9MSE3.PDF > which is an errata sheet for mask set H50W. You can > find it on the product page on the Motorola website > under 68HC711E9. > > The preferred workaround was to be sure that there > is a 1K series resistor between the source of VPP and > the XIRQ pin, to limit the current. > > Hope this is helpful. > > Best regards, > > Kerry Berland > > Silicon Engines > 2101 Oxford Road > Des Plaines, IL 60018 USA > 847-803-6860 > Fax 847-803-6870 > > ----- Original Message ----- > From: "Walter Muth" <> > To: "MotHC11" <> > Sent: Friday, December 13, 2002 7:16 AM > Subject: [m68HC11] New Mask for MC68HC711E9CFN2 ? > > Hi all, > > > > we got new MC68HC711E9CFN2 with mask 4K81H and got problems to > > program it. We had this problem before with a former mask but > > since 2years we had mask 5C47M and no problem at all. > > > > Is there somebody with the same problems? > > > > Regards > > > > > > Walter > > > > > > > > > > > > > > > > To unsubscribe from this group, send an email to: > > > > > > > > > > > > > > > To unsubscribe from this group, send an email to:

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Kerry, Walter --- I did quite a bit of work on this problem at the time. Here is a copy of the essential parts of the latest posting on the issue. I will enclose the latest posting from Motorola on this subject and then add some comments. There is a bit more to the fix than changing the current limiting resistor. As I recall the most important component was the 0.1uF bypass capacitor from Vpp to Gndl. ********************************************************************** ****** ****** Message sent by "John Suchyta" <> to the 68hc11 Mailing List. All, the latest mask set for the HC711E9, H50W, appears to be sensitive to VPP transients. This is a shrink of the older C47M mask. We have added a note to the databook (rev 3.2 is latest) that recommends a 1K resistor on VPP for the 711E9. Some info that may pertain to various situations: We have been able to damage the XIRQ/VPP pin by cycling the VPP supply while VDD=5V without an effective current limit on VPP. On parts that have been damaged, the XIRQ protection diode is shorted to ground. The part can still operate, but in all cases that we have seen the device was not completely programmed, so it would fail a verify step during programming. The programming voltage is not that critical. A 12.0V supply fed to the VPP pin through a 1K resistor appears to work in all instances with a nominal 5V supply on VDD. The VPP supply can (and maybe should) remain on the VPP pin throughout the EPROM programming step. Bob Smith's circuit to prevent application of VPP without 5V on VDD is a good practice, even for other programmable devices. Toggling VPP between bytes is not necessary since the ELAT bit is used to control this internally. The 711E20 still needs a 100 ohm resistor - a 1K resistor dropped programming voltage too much. The latest databook rev on the web states this. ********************************************************************** *** Additional remarks by Bob Smith 1. This problem concerns only the 68HC711E9 with mask set 2H50W. It does not concern other 'HC11 parts or prior mask sets for this device. 2. The final fix that emerged after much come and go on this subject consists of three parts. a. Increase the "current limiting" (series) resistor from the Vpp supply to the Vpp pin to 1000 ohms. b. Be certain that there is a bypass capacitor from the Vpp pin to ground. I used 0.1uF. c. Be certain that there is a pull up/down resistor from the Vpp pin to the Vdd (+5V) supply. Motorola rrecommends 10,000 ohms, I used 4700 ohms successfully. 3. This circuit programs all 2H50W mask parts successfully, but I had some problems with getting *older* parts programmed reliably. I found it necessary to raise Vpp somewhat to get reliable programming of older parts. I believe that I have settled on about 12.75v as the final value. This is probably due to excessive voltage drop in the 1000 ohm resistor on older mask set parts. My next PCB iteration will contain a jumper to select the proper resistor value. CAVEAT -- The above remarks are NOT sanctioned by Motorola. They are based on my experience here in my design lab. Good luck, Bob Smith --- Avoid computer viruses, Practice safe hex --- -- Specializing in small, cost effective embedded control systems -- Robert L. (Bob) Smith Smith Machine Works, Inc. 9900 Lumlay Road Richmond, VA 23236 804/745-1065 ----- Original Message ----- From: "Kerry Berland" <> To: <> Sent: Wednesday, December 18, 2002 5:32 PM Subject: Re: [m68HC11] New Mask for MC68HC711E9CFN2 ? > Walter: > > There was a thread a number of months ago concerning > problems programming the 68HC711E9. It turned out > that chips were being destroyed by excess current into > the VPP/XIRQ pin, effective with a certain new mask. > > There is a PDF file called 68HC711E9MSE3.PDF > which is an errata sheet for mask set H50W. You can > find it on the product page on the Motorola website > under 68HC711E9. > > The preferred workaround was to be sure that there > is a 1K series resistor between the source of VPP and > the XIRQ pin, to limit the current. > > Hope this is helpful. > > Best regards, > > Kerry Berland > > Silicon Engines > 2101 Oxford Road > Des Plaines, IL 60018 USA > 847-803-6860 > Fax 847-803-6870 > > ----- Original Message ----- > From: "Walter Muth" <> > To: "MotHC11" <> > Sent: Friday, December 13, 2002 7:16 AM > Subject: [m68HC11] New Mask for MC68HC711E9CFN2 ? > > Hi all, > > > > we got new MC68HC711E9CFN2 with mask 4K81H and got problems to > > program it. We had this problem before with a former mask but > > since 2years we had mask 5C47M and no problem at all. > > > > Is there somebody with the same problems? > > > > Regards > > > > > > Walter > > > > > > > > > > > > > > > > To unsubscribe from this group, send an email to: > > > > > > > > > > > > > > > To unsubscribe from this group, send an email to:

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