MCP79400 Microchip Technology Inc., MCP79400 Datasheet - Page 15

• Manufacturer Part Number: MCP79400
• Manufacturer: Microchip Technology Inc.

4.2.6
The MCP7940X family of RTCC devices feature a
power-fail time-stamp feature. This feature will save
the time at which V
use this feature, a V
the oscillator must also be running.
There are two separate sets of registers that are used
to record this information:
• The first set located at 0x18h through 0x1Bh are
• The second set of registers, located at 0x1Ch
The power-fail time-stamp registers are cleared when
the V
 2011 Microchip Technology Inc.
loaded at the time when V
operates on the V
bit 4) bit is also set at this time.
through 0x1Fh, are loaded at the time when V
is restored and the RTCC switches to V
BAT
bit is cleared in software.
POWER-FAIL TIME-STAMP
BAT
CC
BAT
. The V
crosses the V
supply must be present and
CC
BAT
fails and the RTCC
(register 0x03h
TRIP
CC
voltage. To
.
CC
MCP7940X
DS25009A-page 15