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EEPROM write/erase

Started by bal_gill21 February 17, 2005

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




Re: EEPROM write/erase
> 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



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 >
>
> --
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