My Question is this:
we used a RTC chip, which part number is M41ST85WMH6,and a M4T32-BR12SH be used on top of it.
when we supplied the power to it from its VCC pin(pin 28),the time is operating in normal mode,but when we removed
the power from its VCC pin,the time is stopped.which should run normally with the battery/crystal.
(when we removed the power from its VCC pin,we measured waveforms with oscilloscope, it had nothing)
we have no ideal to handle it,please hlep us if you met this before,or you knew about it.
Thank You Very Much!