Hi Jon,

Unfortunately not as they aren't continuos in memory.. However just write a
macro or even an inline function this should make it all much more readable.

for instance:

#define WRITE_16BIT_PORT( val ) {PORTA = val & 0xff; PORTD = val >> 8;}
#define READ_16BIT_PORT( val ) {val = (PORTD << 8) | PORTA;}

Hope that helps..

Cheers,
Ash.

---
Ashley Roll
Digital Nemesis Pty Ltd
www.digitalnemesis.com
Mobile: +61 (0)417 705 718




> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Jon Baker
> Sent: Thursday, 25 April 2002 9:02 AM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: [PIC]: C query
>
>
> I'm using an '877 on a 16bit bus, MSB is PortD, LSB is PortB.
> I need to read or write to the bus, and I would like to know
> if I can create a variable in C which references these two
> ports as though they were a single 16bit unsigned int- so
> instead of having to do msb and lsb operations individually.
> PORTB = int & 255; PORTD = int >> 8;  I could use a single
> variable [eg PORTDB ] in these operations: PORTDB = int;
>
> obviously the compiler will split it up into 2 8bit
> operations, and I don't even care if the code is smaller or
> (slightly) larger- but it would really make my code easier to
> get my head around at the moment :)
>
> Thanks
>
> Jon Baker
>
> --
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>
>

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