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2005-07-03 by tonalbuilder2002
I'm designing a LPC2138 board without an external RTC xtal circuit. Any ideas how to handle the RTCX1 & RTCX2 real time clock oscillator pins when not used? The manual doesn't seem to have a recommendation for this. Bill T. http://www.kupercontrols.com
2005-07-03 by sudip nag
Hi Bill,
LPC2138 RTC pins may be kept unwired (do not connect any thing) and let the registers in default state while you are not using. There is no special consideration for this and thus trivial to mention in datasheet. The RTC register definition is sufficient.
Sudip
tonalbuilder2002 <twentiethwave@...> wrote:
I'm designing a LPC2138 board without an external RTC xtal circuit.
Any ideas how to handle the RTCX1 & RTCX2 real time clock oscillator
pins when not used? The manual doesn't seem to have a recommendation
for this.
Bill T.
http://www.kupercontrols.com
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[Non-text portions of this message have been removed]2005-07-05 by lp2000c
I was told by someone at Philips that RTXC1 (input pin) should be tied to ground, and RTXC2 (output pin should be left unconnected). This makes sense to me. Leaving an input pin floating does not sound like a good idea, even if the function of that pin is disabled. Philips Apps: How about spec'ing this in the next Data Sheet and User Manual release. --- In lpc2000@yahoogroups.com, sudip nag <sudipnag1@y...> wrote: > Hi Bill, > LPC2138 RTC pins may be kept unwired (do not connect any thing) and let the registers in default state while you are not using. There is no special consideration for this and thus trivial to mention in datasheet. The RTC register definition is sufficient. > > Sudip > > tonalbuilder2002 <twentiethwave@h...> wrote: > I'm designing a LPC2138 board without an external RTC xtal circuit. > Any ideas how to handle the RTCX1 & RTCX2 real time clock oscillator > pins when not used? The manual doesn't seem to have a recommendation > for this. > > Bill T. > http://www.kupercontrols.com > > > > > > > > > > --------------------------------- > YAHOO! GROUPS LINKS > > > Visit your group "lpc2000" on the web. > > To unsubscribe from this group, send an email to: > lpc2000-unsubscribe@yahoogroups.com > > Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service. > > > --------------------------------- > > > > > --------------------------------- > How much free photo storage do you get? Store your friends n family photos for FREE with Yahoo! Photos.
> http://in.photos.yahoo.com > > [Non-text portions of this message have been removed]