PIC24F16KA102 datasheet(153/254 Pages) MICROCHIP

153 / 254 page

Preliminary

DS39927B-page 151

PIC24F16KA102 FAMILY

19.0

REAL-TIME CLOCK AND

CALENDAR (RTCC)

The RTCC provides the user with a Real-Time Clock

and Calendar (RTCC) function that can be calibrated.

Key features of the RTCC module are:

• Operates in Deep Sleep mode

• Selectable clock source

• Provides hours, minutes and seconds using

24-hour format

• Visibility of one half second period

• Provides calendar – weekday, date, month and

year

• Alarm-configurable for half a second, one second,

10 seconds, one minute, 10 minutes, one hour,

one day, one week, one month or one year

• Alarm repeat with decrementing counter

• Alarm with indefinite repeat chime

• Year 2000 to 2099 leap year correction

• BCD format for smaller software overhead

• Optimized for long-term battery operation

• User calibration of the 32.768 kHz clock

crystal/32K INTRC frequency with periodic

auto-adjust

19.1

RTCC Source Clock

The user can select between the SOSC crystal

oscillator or the LPRC internal oscillator as the clock

reference for the RTCC module. This is configured

using the RTCCKSEL (FDS<5>) Configuration bit. This

gives the user an option to trade off system cost,

accuracy and power consumption, based on the overall

system needs.

FIGURE 19-1:

RTCC BLOCK DIAGRAM

Note:

This data sheet summarizes the features of

this group of PIC24F devices. It is not

intended to be a comprehensive reference

source. For more information on the

Real-Time Clock and Calendar, refer to the

“PIC24F

Family

Reference

Manual”

Section 29. “Real-Time Clock and

Calendar (RTCC)”

(DS39696).

RTCC Clock Domain

CPU Clock Domain

RTCC

RTCC Prescalers

RTCC Timer

Comparator

Alarm Registers with Masks

Repeat Counter

0.5 Sec

RTCC Interrupt Logic

ALRMVAL

RTCVAL

ALCFGRPT

RCFGCAL

Alarm

Event

YEAR

MTHDY

WKDYHR

MINSEC

ALMTHDY

ALWDHR

ALMINSEC

RTCC

Interrupt

RTSECSEL<1:0>

RTCOE

Clock Source

Alarm Pulse

Input from

SOSC/LPRC

Oscillator

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