Rolf wrote :
> Can you point me to something that indicates how to properly
> deal with the instruction (RETLW 0x??) at 0x3FF? The 12F675
> datasheet just indicates that it is there.

What about "Example 9-1" on page 54 ?
(Page number could be different, I'm not sure I have
the latest datasheet...)

> My reading of the 12F datasheet suddenly became more critical 
> when I realised that the Oscilator was very different in the 12F675.

This is one of the nice things with the 8-pin 12F683. It has the
new 8 Mhz INTOSC that is factory callibrated, so there is
no calibration value that can be erased at all. Instead there is
a OSCTUNE register where you can tune the freq aprox +/- 12%
in 32 steps. But the b'00000' (reset value) is always the factory
callibrated freq.

Besides of that, compared with the 12F675, the 12F683 also
have a PWM module, 2 Kword flash and more RAM.
Nice chip....

Jan-Erik.



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