Re: [uCsimm] Battery Backup RTC

From: David Williams (
Date: Thu Jul 06 2000 - 00:29:35 EDT

The Dragonball RTC uses the same power source as the CPU. Therefore you
must ensure that VCC is powered at all times to ensure that RTC keeps
working. To acheive low power operation you put the CPU into low power
mode and RTC continues to run. To use a Lithium Cell or other such
backup power it must be connected to VCC somehow (ie in parallel with
main supply - obviously being careful not to charge or drain the Lithium
Cell while running from the external power source.)


SZ wrote:
Does the uCSimm H/W does consider to make use of the Dragonball RTC ?
Can it be backup by say, Li Cell such as CR2032? With
the system shutdown and the RTC clicking?
We've try to look into but seems it can't be. Does anyone ever tried to
implement it?

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