> =A0Up until now, I've only used the older (lower end?) PICs

16F and lower don't have LAT.

> I think I understand the difference between PORTx and LATx, but in one
> data sheet Microchip show port B being initialised like so:
>
> BANKSEL =A0 =A0 PORTB
> CLRF =A0 =A0 =A0 =A0PORTB
> BANKSEL =A0 =A0 LATB
> CLRF =A0 =A0 =A0 =A0LATB
> BANKSEL =A0 =A0 ANSELB
> CLRF =A0 =A0 =A0 =A0ANSELB
> BANKSEL =A0 =A0 TRISB
> CLRF =A0 =A0 =A0 =A0TRISB
>
> Why bother clearing TRISB when you would be only writing to LATB anyway?
> David...

TRIS controls the direction of the pin (e.g. input or output).
Use PORT when you want to read a digital input.
Use LAT when you want to write a digital output.

See http://www.piclist.com/techref/readmodwrite.htm

-Scott

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