PIC24F32KA302-ISLASHML datasheet(197/364 Pages) MICROCHIP

197 / 364 page

 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

VDD 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.

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)

PIC24F32KA302-I/ML Datasheet(PDF) 197 Page - Microchip Technology

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