[U-Boot-Users] mpc8xx RTC questions
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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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
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
participants (3)
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Sam Song -
Steven Scholz -
Wolfgang Denk