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00D RT - Status Register D
1xxx xxxx Valid RAM
This read-only bit monitors the power-sence pin. A
low state of this pin indicates a loss of power to
the real-time clock (dead-battery). When set to 1,
this bit indicates that the real-time clock has
power. When set to 0, it indicates that the real-
time clock has lost power.
x111 1111 Reserved