> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On
Behalf
> Of MSR7
> Sent: 14 April 2010 17:43
> To: piclist@mit.edu
> Subject: [PIC] Basic question abou pointer
> 
> 
> Hi all,
> 
> I declared a struct with four member byte variables, where one member
is a
> pointer, like this:
> 
> struct Temp
> {
>     unsigned char  Var00;
>     unsigned char  Var01;
>     unsigned char  Var02;
>     unsigned char *Var03;
> };
> 
> When i  watch the values in the Watch window, all the variables have
eight
> bits, except the pointer variable, which is 16 bits.
> 
> All the pointer variables will have 16 bits, whatever you declare it
as
> byte
> or word?

The size of the pointer is determined by the range of addresses it has
to cover, and this is the same irrespective of the data type it is
pointing to.

For instance with the older HiTech compiler with a 14 bit target you
could define a pointer which could only cover two banks, and since a
bank is 128 bytes this pointer was only 8 bits in size.  A pointer to
program memory was always 16 bits in size in this case.

If you start using a micro with a very large address space (e.g. 32 bit
micros such as ARM/MIPS etc), then the pointers are going to be
proportionally larger due to the much larger address space.

Mike

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