That is the way it works in a 12C508, I expect the same applies to your
chip.

The movlw will just leave the value in "W". You'll have to something with it
for it to have any affect.

btw: remember, you still won't get 'exactly' 4MHz, and the frequency you do
get will vary over supply voltage, temperature, and perhaps the phase of the
moon.

Bob Ammerman
RAm Systems
(contract development of high performance, high function, low-level
software)

----- Original Message -----
From: Andrej Vuga <andrej.vuga@GUEST.ARNES.SI>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Wednesday, September 06, 2000 8:07 AM
Subject: [PIC]: 16C505 & OSCCAL


> Hello!
>
> I'm working with 16C505. I've read the last memory location (for eg. movlw
0x54), which I'll reprogram after erase (I'm working with JW eprom version).
>
> I'm wondering if there must be the instruction :
>
> movwf OSCCAL
>
> at the beginnig of the programme, if I want to work at exacly 4MHz
(internal oscillator).
>
> Thanks
> Andrej Vuga
>
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