Dave Turner wrote :

> > But if so, why do you have lines like these in your source : ????
> > 
> > > rcsta equ     18h
> > > txreg equ     19h
> > > txsta equ     98h     ; my own definitions of some key 
> USART locations
> > > spbrg equ     99h
> > 
> > They are already defined in P16F87.INC.
> > Don't you get any warnings about "multiply defined symbols"
> > Have you disabled "case sensitivity" in MPALB. Recomended, IMHO...
> 
> I always have case sensetivity on...

Why ?
Bad idea, if you ask me...

> I just discovered whilst reading the datasheet that intrc isn't
> actually the internal 8mhz osc, but an internal RC (well, duh, but I
> didn't notice)...

Some older PICs had a internal low prec RC osc. Some newer PICs
have a higher prec internal RC osc. Some PIC call the new
internal osc INTRC, some other INTOSC. Confusing ? Yes.

In the case of the 16F87, it's called INTRC.

> Does anyone know which config option to use for the
> internal 8MHz osc?  (any __config source code versions are also
> welcome)


Directly from P16F87.INC :

_INTRC_CLKOUT                EQU     H'3FFD'
_INTRC_IO                        EQU     H'3FFC'


Also read :
"18.3 DC Characteristics: Internal RC Accuracy"
in the data sheet !

Jan-Erik.



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