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Discussion Groups | 68HC12 | WOW! Fast Pgm
Join our technical discussions about Freescale Microcontrollers: M68HC12. (Freescale Semiconductor is a Subsidiary of Motorola).
WOW! Fast Pgm - Stewart Prince - Sep 7 15:46:00 2003
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We're using the D60A and just tried the AUTO programming method for the EEPROM. Our previous delay was 10 ms and now it's about 1 ms. That's a 90% time savings per programming pulse! Stewart Prince Professor, Mech Eng CSUN |
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Re: WOW! Fast Pgm - Oliver Betz - Sep 8 10:22:00 2003
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Stewart Prince wrote: > We're using the D60A and just tried the AUTO programming method for the > EEPROM. Our previous delay was 10 ms and now it's about 1 ms. That's a > 90% time savings per programming pulse! I measured <300us programming time and 500us erasing time. But you shouldn't rely on this - I was told that the erasing/programming time can be much longer when the EEPROM cell has been programmed very often. Oliver -- Oliver Betz, Muenchen |
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Re: WOW! Fast Pgm - Gordon Doughman - Sep 8 13:00:00 2003
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Oliver, The D60A spec states 500 uS max programming time and 10 mS max erase time with the AUTO bit set. Regards, Gordon Oliver Betz wrote: >Stewart Prince wrote: >>We're using the D60A and just tried the AUTO programming method for the >>EEPROM. Our previous delay was 10 ms and now it's about 1 ms. That's a >>90% time savings per programming pulse! >> > >I measured <300us programming time and 500us erasing time. But you >shouldn't rely on this - I was told that the erasing/programming time >can be much longer when the EEPROM cell has been programmed very >often. > >Oliver -- =============================================================== Gordon Doughman Ph: 937-438-6811 Motorola Semiconductor Fax: 937-434-7457 Field Applications Engineer Pager: 800-759-8352 Pin: 1304089 Suite 175 3131 Newmark Drive Miamisburg, OH 45342 Check out my HC12 book at: http://www.rtcbooks.com/programming.php |
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Re: WOW! Fast Pgm - Oliver Betz - Sep 9 1:39:00 2003
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Gordon Doughman wrote: > The D60A spec states 500 uS max programming time and 10 mS max erase > time with the AUTO bit set. I know. Since the _measured_ erase time of a new D60A is 20 times shorter, I wondered whether this is a wrong spec and made a "service request". Motorola told me "As the part ages you will need a longer time to erase or program the eeprom. If the time required does need to be 10 ms you are probably looking at a device with a very tired eeprom." Well, I assume that 10ms is a *very* conservative spec, but one has to respect it for a safe design. Oliver -- Oliver Betz, Muenchen |
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Re: WOW! Fast Pgm - Stewart Prince - Sep 9 13:31:00 2003
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Oliver I just measured the time to program, not to erase. However, if the program time was 10ms and the erase time was 10ms without the AUTO bit, the worst case scenario would be 10ms erase and .5ms program which is close to a 50% time reduction. Still a huge time savings and well worth it. BTW, I don't understand why the EEPROM is byte eraseable and the FLASH is not. Stewart Prince Professor, Mech Eng CSUN Oliver Betz wrote: >Gordon Doughman wrote: > >>The D60A spec states 500 uS max programming time and 10 mS max erase >>time with the AUTO bit set. >> >> > >I know. Since the _measured_ erase time of a new D60A is 20 times >shorter, I wondered whether this is a wrong spec and made a "service >request". Motorola told me "As the part ages you will need a longer >time to erase or program the eeprom. If the time required does need >to be 10 ms you are probably looking at a device with a very tired >eeprom." > >Well, I assume that 10ms is a *very* conservative spec, but one has >to respect it for a safe design. > >Oliver [Non-text portions of this message have been removed] |
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