* [U-Boot-Users] mpc8xx RTC questions
[not found] <E1BSAKG-00045I-Pe@sc8-sf-list1.sourceforge.net>
@ 2004-05-25 1:12 ` Sam Song
2004-05-25 8:06 ` Wolfgang Denk
0 siblings, 1 reply; 3+ messages in thread
From: Sam Song @ 2004-05-25 1:12 UTC (permalink / raw)
To: u-boot
Hi,
When setting "#define CONFIG_RTC_MPC8xx" ,how could I
do in my hardware scheme to make it really work?I mean
what kind of battery(Capacity and Type) and how to
connect it with 8xx?Someone said HW must monitor the
power status and before power failed SW could set 8xx
into powerdown mode for keeping 8xx RTC still work
with battery.Is this so?
Best regards,
Sam
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^ permalink raw reply [flat|nested] 3+ messages in thread* [U-Boot-Users] mpc8xx RTC questions
2004-05-25 1:12 ` [U-Boot-Users] mpc8xx RTC questions Sam Song
@ 2004-05-25 8:06 ` Wolfgang Denk
2004-05-25 8:29 ` Steven Scholz
0 siblings, 1 reply; 3+ messages in thread
From: Wolfgang Denk @ 2004-05-25 8:06 UTC (permalink / raw)
To: u-boot
In message <20040525011243.40738.qmail@web15212.mail.bjs.yahoo.com> you wrote:
>
> When setting "#define CONFIG_RTC_MPC8xx" ,how could I
> do in my hardware scheme to make it really work?I mean
> what kind of battery(Capacity and Type) and how to
> connect it with 8xx?Someone said HW must monitor the
This is a hardware design question and far beyond the topics of this
mailing list. I'm pretty sure you can find some refernce design on
the Motorola web pages.
> power status and before power failed SW could set 8xx
> into powerdown mode for keeping 8xx RTC still work
> with battery.Is this so?
See the MPC8xx User's Manual, section "Clocks and Power Control".
Best regards,
Wolfgang Denk
--
Software Engineering: Embedded and Realtime Systems, Embedded Linux
Phone: (+49)-8142-4596-87 Fax: (+49)-8142-4596-88 Email: wd at denx.de
God grant me the senility to accept the things I cannot change, The
frustration to try to change things I cannot affect, and the wisdom
to tell the difference.
^ permalink raw reply [flat|nested] 3+ messages in thread
* [U-Boot-Users] mpc8xx RTC questions
2004-05-25 8:06 ` Wolfgang Denk
@ 2004-05-25 8:29 ` Steven Scholz
0 siblings, 0 replies; 3+ messages in thread
From: Steven Scholz @ 2004-05-25 8:29 UTC (permalink / raw)
To: u-boot
Wolfgang Denk wrote:
> In message <20040525011243.40738.qmail@web15212.mail.bjs.yahoo.com> you wrote:
>
>>When setting "#define CONFIG_RTC_MPC8xx" ,how could I
>>do in my hardware scheme to make it really work?I mean
>>what kind of battery(Capacity and Type) and how to
>>connect it with 8xx?Someone said HW must monitor the
>
> This is a hardware design question and far beyond the topics of this
> mailing list. I'm pretty sure you can find some refernce design on
> the Motorola web pages.
And BTW the RTC on MPC8xx draws much to much current! It's broken. See
Errata for these proceossors.
Steven
^ permalink raw reply [flat|nested] 3+ messages in thread
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2004-05-25 1:12 ` [U-Boot-Users] mpc8xx RTC questions Sam Song
2004-05-25 8:06 ` Wolfgang Denk
2004-05-25 8:29 ` Steven Scholz
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