PIC24FJ128GA310 datasheet(287/406 Pages) MICROCHIP

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 2010-2011 Microchip Technology Inc.

DS39996F-page 287

PIC24FJ128GA310 FAMILY

FIGURE 22-2:

ALARM MASK SETTINGS

22.6

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 lower power mode (Sleep, Deep

Sleep, etc.).

To use this feature:

Enable the RTCC (RTCEN = 1).

Set the PWCEN bit (RTCPWC<15>).

Configure the RTCC pin to drive the PWC control

signal (RTCOE = 1 and RTCOUT<1:0> = 11).

The polarity of the PWC control signal may be chosen

using the PWCPOL bit (RTCPWC<14>). An active-low

or active-high signal may be used with the appropriate

external switch to turn on or off the power to one or

more external devices. The active-low setting may also

be used in conjunction with an open-drain setting on

the RTCC pin, in order to drive the ground 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.

22.7

RTCC VBAT OPERATION

The RTCC can operate in VBAT mode when there is a

power loss on the VDD pin. The RTCC will continue to

operate if the VBAT pin is powered on (it is usually

connected to the battery).

The VBAT BOR can be enabled/disabled using the

VBTBOR bit in the CW3 Configuration register

(CW3<7>). If the VBTBOR enable bit is cleared, the

VBAT BOR is always disabled and there will be no indi-

cation of a VBAT BOR. If the VBTBOR bit is set, the

RTCC can receive a Reset and the RTCEN bit will get

cleared; it can happen anywhere between 1.95-1.4V

(typical).

Note

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)

Note:

It is recommended to connect the VBAT

pin to VDD if the VBAT mode is not used

(not connected to the battery).

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