> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On
Behalf
> Of Matthew Rhys-Roberts
> Sent: 12 November 2008 09:08
> To: Microcontroller discussion list - Public.
> Subject: Timer0 variations in PIC18F series?
> 
> Hi there
> 
> Without going into too much detail, does anyone know of any
significant
> variations in the way that the timer0 module is implemented, across
the
> 18F range? Or between 16F and 18F? (i.e. just in terms of
functionality
> and register names).
> 
> I'm hoping that timer0 is an identical internal peripheral throughout
> all PIC types.
> 
> Thanks
> Matt

Off the top of my head I can think of the following differences:

                    16F           18F
Config register     OPTION        T0CON
Timer size          8bit          8/16 bit configurable.
Interrupt bits      T0IE, T0IF    TMR0IE, TMR0IF
Timer control bit   None          TMR0ON

On the 16F part the PSA bit assigns the pre-scaler to either timer 0 or
the watchdog timer.  In the 18F it either enables or disables the
pre-scaler, it's never assigned to the watchdog timer.

In 8 bit mode the general operation of the 18F timer 0 is very simmilar
to the 16F in most respects, the same pre-scaler ratios are available
etc.

Regards

Mike

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