Lpc2000

--- In lpc2000@yahoogroups.com, "onceinfour" <mmack287@h...> wrote:
> I am thinking of using an LPC22xx as a single chip micro in an 
> industrial controller board.  2 questions.  I assume the device can 
> be used to count external pulses, encoder signal, which pin(s) can be 
> used for a counter i/p?  
> The LPC2xxx's supposedly have a built in RTC?  Anyone got any info on 
> connecting a battery or super cap to maintain the RTC contents during 
> power down?

Hi,

the 22xx (as well as the 21xx) do not feature counter inputs (yet) but
capture inputs to capture an internal free running timer. 

The RTC only runs when the device is at least in idle mode. In other
words, it is perfect for an application that is always connected to
power or to measure "work-hours" for what ever kind of machine. It is
not well suited for keeping time when the system is operated by a
battery and has significant "off-time" and the time reference should
be kept alive. Simply put, there is no 32-kHz input.

We are aware that we need to chance this. It will be implemented (both
counter inputs and 32-khz input on a device coming in fall 2004. 

Our team is very greatful for all the questions asked (and answered!)
here in this forum and rest assured that some of the answers are also
from us ;-)

Best regards from the Philips Apps Team.
p.s. I intend to post more "official statements" on this group in the
future.