Lpc2000

--- In lpc2000@yahoogroups.com, "ndhegde" <ndhegde@...> wrote:
>
> Hello,
> I am trying to understand installing exception handlers from C (Ref: 
> ARM developer guide, sec 5.3.2). 
> Could anyone please elaborate the step wherein "subtract 8 to allow 
> prefetching " is done?
> 
> Thanks
> Nikhil
>

When your instruction at address A is being processed, the next
instruction at address A+4 is already fetched so the PC is pointing to
A+8.
So if your instruction involves PC manipulation you have to take in
account of this.