Problem of RTC when power is off ? | LPC2000

Discussion group dedicated to the Philips LPC2000 family of ARM MCUs

RTC is working fine as long as power is on.When remove the power and take time and again giving power,RTC is started running with time where i remove the power.It means not showing the correct time.i am using PLCK as clock source for RTC.There is no interrupts in my code.can i know what may be the problem? any help,thank in advance.

------------------------------------

(You need to be a member of lpc2000 -- send a blank email to lpc2000-subscribe@yahoogroups.com )

----Original Message----
From: l...@yahoogroups.com
[mailto:l...@yahoogroups.com] On Behalf Of raju_nem
Sent: 03 November 2009 11:48 To: l...@yahoogroups.com
Subject: [lpc2000] Problem of RTC when power is off ?

> RTC is working fine as long as power is on.When remove
> the power and take time and again giving power,RTC is
> started running with time where i remove the power.It
> means not showing the correct time.i am using PLCK as
> clock source for RTC.There is no interrupts in my
> code.can i know what may be the problem? any help,thank
> in advance.

You have to use external 32KHz crystal to keep RTC running on battery
power. PCLK stops when the main system power is removed.

--
Tim Mitchell

------------------------------------

(You need to be a member of lpc2000 -- send a blank email to lpc2000-subscribe@yahoogroups.com )

Thank u,Tim Mitchell.

I selected the external 32khz clock.Now it is working fine even when power is off or reset.
--- In l...@yahoogroups.com, "Tim Mitchell" wrote:
>
> ----Original Message----
> From: l...@yahoogroups.com
> [mailto:l...@yahoogroups.com] On Behalf Of raju_nem
> Sent: 03 November 2009 11:48 To: l...@yahoogroups.com
> Subject: [lpc2000] Problem of RTC when power is off ?
>
> > RTC is working fine as long as power is on.When remove
> > the power and take time and again giving power,RTC is
> > started running with time where i remove the power.It
> > means not showing the correct time.i am using PLCK as
> > clock source for RTC.There is no interrupts in my
> > code.can i know what may be the problem? any help,thank
> > in advance.
>
> You have to use external 32KHz crystal to keep RTC running on battery
> power. PCLK stops when the main system power is removed.
>
> --
> Tim Mitchell
>

------------------------------------

(You need to be a member of lpc2000 -- send a blank email to lpc2000-subscribe@yahoogroups.com )

Sign in

Search lpc2000

Subscribe to lpc2000

lpc2000 by Keywords

Ads

Discussion Groups

See Also

Discussion Groups | LPC2000 | Problem of RTC when power is off ?

Problem of RTC when power is off ? - raju_nem - Nov 3 6:48:54 2009

RE: Problem of RTC when power is off ? - Tim Mitchell - Nov 3 7:38:11 2009

Re: Problem of RTC when power is off ? - raju_nem - Nov 3 7:47:43 2009