Lpc2000

Hi Bruce,

There is no shorter way that this could be done. Also, please note, 
while reading the VPBDIV, it should be read twice. So you would want 
to do the following steps.

old= VPBDIV;
old= VPBDIV;

Thanks
Philips apps


--- In lpc2000@yahoogroups.com, Bruce Paterson <bruce@t...> wrote:
> Question below:
> 
> philips_apps wrote:
> > 
> > Hi Kerem,
> > 
> > This is actually a bug which is related to the EXTINT.1 bug 
(present 
> > in the Errata sheet). 
> > 
> > Problem: Incorrect setting of EXTMODE and/or EXTPOLAR register 
while 
> > trying to set them to desired value. 
> ...
> > Before writing to the EXTMODE and EXTPOLAR registers,
> > 1> Write 0x0 to VPBDIV 
> > 2> Then write the desired value to EXTMODE or EXTPOLAR register. 
> > 3> Then write the same value to VPBDIV ( additional step)
> 
> If I want to program both EXTMODE and EXTPOLAR, do I have to do this
> in two passes: old=VPBDIV, VPBDIV=0, EXTMODE=n, VPBDIV=n, VPBDIV=0, 
> EXTPOLAR=y, VPBDIV=y, VPCDIV=old ?
> (or can fewer steps be used somehow ?)
> 
> -- 
> Cheers,
> Bruce
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