Lpc2000

I spoke to Philips Apps today, and was informed the memory bus will 
always go to high impedance, ignoring the fact the datasheet says 
pullups are there on these ports.

--- In lpc2000@yahoogroups.com, "otc_friend" <otc_friend@g...> wrote:
> >To reduce power consumption in power down mode, I use PINSEL2 to
> >disconnect the EMC and revert external memory bus to inputs. Since
> >these are on P2 and P3 with internal pullups, I should see 3.3V
> >correct? In actuality, I'm seeing them float around 2.2V. I've 
tried
> >to reset the IOxDIR bits as inputs, but still no 3.3V. This is 
true
> >even for CS1, 2 & 3 pins which are not connected to anything
> >externally. Does anyone know what can cause this?
> Often the impedance is very high in such a mode. I don't know the 
exact
> circuit Philips uses and don't have a part here to try it out.
> What is the resistance of your multimeter? Even with 10Megohms you 
may see a
> significant voltage drop. Try to measure both against GND and 
against VCC.
> This will show you if you measure the pin voltage correctly. Both 
values
> added must be the same result as the absolute value of VCC minus 
GND.
> 
> A look in the datasheet done?!
> 
> Hope it helps.
> 
> regards -
> Henry
> 
> <Schau auch mal auf meine Homepage www.ehydra.dyndns.info>
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