Yes you are correct should of been _BORV_20_2L. I did try and increase
value
to _BORV_42_0L with no success. However I was able to resolve this
problem,
seems with slow Vdd rise times (<10ms) the EEPROM may get locked. Doing a
dummy write to an unused EEPROM location will unlock the EEPROM and stored
values will be read correctly. Thank you for the response.
"dk" <mcdivyakanth@[EMAIL PROTECTED]
> wrote in message
news:8564459e-33ca-43c2-8826-45298130fadd@[EMAIL PROTECTED]
Feb 25, 2:05 pm, "bill" <williamsmit...@[EMAIL PROTECTED]
> wrote:
> Hi All
> I am currently using a 18f4431 to control motor position. During program
> execution I have a few variables I store to the internal Data EEProm.
Some
> of these get updated every time the motor is commanded to move, and some
> only during a calibration routine which may only happen once. But all
> variables get read during a power up. The problem is these varibles are
> getting corrupt after a power down-power up. During exectution I am
> reading
> the data EEProm values and outputting them to a HyperTerm screen, so it
> appears the are being stored Okay. I have the brown out voltage enabled
to
> 2.0 v. I don't understand how come they are not correct after a power
> down,
> could anyone please Help.
Suggest you to increase the brown out voltage. Also i fail to
understand how you have set the BOV to 2.0 as datasheet tells me you
can't set the BOV to 2.0V for 18F4431
-dK
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