> How exactly do I use Timer 2 as the clock source for SPI? I am using a
> 17C756A, but guess it will be similar on other micros.

I wouldn't be guessing here.  You should read the data sheet for each
family as you use it.  The 17 family is a little older than the 16 and has
some differences in the UART and maybe the MSSP too.

> Does the clock toggle
> every time the timer 'ticks', or only when the timer rolls over and
> generates an interupt? The data book does not describe it well.
>
> I am trying to get an ~2.5MHz clock speed for my SPI link with a 20MHz
xtal,
> can it be done?

I've only used the PIC17 MSSP in IIC mode, so I can only tell you my
interpretation of the manual.  It seems rather clear, however.  You set
the SSPM3..SSPM0 bits in SSPCON1 to 0011 to select SPI master mode with
clock = timer2 / 2.  You want 2.5MHz, which is Fosc/8 in your case.  Set
up timer 2 to increment from Fosc/4, then set the period register PR2 to 0
so that the timer 2 output is also Fosc/4.  The SPI clock will then be
Fosc/8.


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