Lpc2000

At 02:28 PM 7/8/04 -0700, you wrote:
>hi Robert,
> >>uart0 interrupt is enabled in startup.s section of
>the code.
>and i am setting the Pll configuration in main which
>is executed later

That might be a problem.  The pll_load writes must me successive writes so 
if an interrupt were to occur between writes the update would fail.  I 
think I'd expect your symptoms to be more intermittent though.  nonetheless 
I'd disable interrupts while you are updating the pll (actually I'd disable 
them for the whole routine).  That's a problem but probably not the problem.


> >>the REG defination is as below
>#define REG(addr) (*(volatile unsigned long*)(addr))

I don't believe it's an ANSI compliant lvalue (IE it's not allowed to 
assign to it), but compilers that support it as an lvalue should do the 
logical thing.

Robert

" 'Freedom' has no meaning of itself.  There are always restrictions,
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                         Kelvin Throop, III