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Discussion Groups | M68HC11 | EEPROM write/erase
Technical discussions about Freescale Microcontrollers: M68HC11. (Freescale Semiconductor is a Subsidiary of Motorola).
EEPROM write/erase - bal_gill21 - Feb 17 13:36:00 2005
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Hi all, Can anyone tell me the actual delay times that are involved with writing to the 68hc711e9 EEPROM? Do you have to erase the byte first then write it, or can it be overwritten by a new value? The manual suggests a write/erase time of 10ms, but it's not too clear if you have to erase the byte first. Thanks Bal |
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RE: EEPROM write/erase - Redd, Emmett R - Feb 17 13:56:00 2005
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> From: bal_gill21 [mailto:] > Sent: Thursday, February 17, 2005 11:37 AM > > Hi all, > Can anyone tell me the actual delay times that are involved with > writing to the 68hc711e9 EEPROM? Do you have to erase the byte first > then write it, or can it be overwritten by a new value? The manual > suggests a write/erase time of 10ms, but it's not too clear if you > have to erase the byte first. Thanks > > Bal Yes, all the bits that are already low but are programmed to be high must be erased to high. The non-confusing way is to erase the byte or bulk erase the device. If you are using BUFFALO, all this is relatively easy. Emmett Redd Ph.D. mailto: Associate Professor (417)836-5221 Department of Physics, Astronomy, and Materials Science Southwest Missouri State University Fax (417)836-6226 901 SOUTH NATIONAL Dept (417)836-5131 SPRINGFIELD, MO 65804 USA |
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Re: EEPROM write/erase - Bob Smith - Feb 17 14:31:00 2005
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I believe the information you need is well documented in the "Technical Data Manual" for the E Series devices. Best wishes, Bob Smith --- Avoid computer viruses, Practice safe hex --- -- Specializing in small, cost effective embedded control systems -- http://www.smithmachineworks.com/embedprod.html Robert L. (Bob) Smith Smith Machine Works, Inc. 9900 Lumlay Road Richmond, VA 23236 804/745-2608 ----- Original Message ----- From: "bal_gill21" <> To: <> Sent: Thursday, February 17, 2005 12:36 PM Subject: [m68HC11] EEPROM write/erase > > Hi all, > Can anyone tell me the actual delay times that are involved with > writing to the 68hc711e9 EEPROM? Do you have to erase the byte first > then write it, or can it be overwritten by a new value? The manual > suggests a write/erase time of 10ms, but it's not too clear if you > have to erase the byte first. Thanks > > Bal > > > Yahoo! Groups Sponsor > ADVERTISEMENT > -------------------------------------------------------------------------- ------ > Yahoo! Groups Links > > a.. To |
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