Datasheet

 2011-2013 Microchip Technology Inc. DS39995D-page 197
PIC24FV32KA304 FAMILY
FIGURE 19-2: ALARM MASK SETTINGS
19.5 POWER CONTROL
The RTCC includes a power control feature that allows
the device to periodically wake-up an external device,
wait for the device to be stable before sampling wake-up
events from that device and then shut down the external
device. This can be done completely autonomously by
the RTCC, without the need to wake from the current
low-power mode (Sleep, Deep Sleep, etc.).
To enable this feature, the RTCC must be enabled
(RTCEN = 1), the PWCEN register bit must be set and
the RTCC pin must be driving the PWC control signal
(RTCOE = 1 and RTCOUT<1:0> = 11).
The polarity of the PWC control signal may be chosen
using the PWCPOL register bit. Active-low or
active-high may be used with the appropriate external
switch to turn on or off the power to one or more exter-
nal devices. The active-low setting may also be used in
conjunction with an open-drain setting on the RTCC
pin. This setting is able to drive the GND pin(s) of the
external device directly (with the appropriate external
V
DD pull-up device), without the need for external
switches. Finally, the CHIME bit should be set to enable
the PWC periodicity.
Note 1: Annually, except when configured for February 29.
s
ss
mss
mm s s
hh mm ss
dhhmmss
dd hh mm ss
mm d d h h mm s s
Day of
the
Week
Month Day Hours Minutes Seconds
Alarm Mask Setting
(AMASK<3:0>)
0000 - Every half second
0001 - Every second
0010 - Every 10 seconds
0011 - Every minute
0100 - Every 10 minutes
0101 - Every hour
0110 - Every day
0111 - Every week
1000 - Every month
1001 - Every year
(1)