How to Reset Osccal Value

[Pic2008]

Hi,

You sure ???



Alain

Yes, I'm sure. greensasquatch pointed that the original value from the chip is 30H.

greensasquatch, without writing @ ORG 3FFh and @ RETLW 30h, have you tried the method I have written here?

[Acetronics2]

Hi,

Not so sure ...

as you write the cal value in a "non protected" memory location and not at the end of the program memory ...

you'll lose the cal value if you use the '675 for another program.

so it's much better to write it at the end of the program memory, as programmers will read it ( and preserve it ) if you do not remember what you had done ... some weeks later.

Alain

[Archangel]

Here is a copy / paste from one of my programs 12F675:

POKECODE @$3FF, $50  ' reintroduces osscal correction data
                         ' $3FF tells it where to code, $50 is the
                         ' Cal value unique to each individual chip.

[Pic2008]

Hi,

Not so sure ...

as you write the cal value in a "non protected" memory location and not at the end of the program memory ...

you'll lose the cal value if you use the '675 for another program.

so it's much better to write it at the end of the program memory, as programmers will read it ( and preserve it ) if you do not remember what you had done ... some weeks later.

Alain

There are two ways of doing it, either write to the OSCCAL directly or like you said, write at the end of program memory at 0x3FF.

Good point.