64GA106 datasheet(211/330 Pages) MICROCHIP

211 / 330 page

 2010 Microchip Technology Inc.

DS39905E-page 211

PIC24FJ256GA110 FAMILY

19.0

REAL-TIME CLOCK AND

CALENDAR (RTCC)

The Real-Time Clock and Calendar (RTCC) provides

on-chip, hardware-based clock and calendar function-

ality with little or no CPU overhead. It is intended for

applications where accurate time must be maintained

for extended periods with minimal CPU activity and

with limited power resources, such as battery-powered

applications.

Key features include:

• Time data in hours, minutes and seconds, with a

granularity of one-half second

• 24-hour format (military time) display option

• Calendar data as date, month and year

• Automatic, hardware-based day of week and leap

year calculations for dates from 2000 through

2099

• Time and calendar data in BCD format for

compact firmware

• Highly configurable alarm function

• External output pin with selectable alarm signal or

seconds “tick” signal output

• User calibration feature with auto-adjust

A simplified block diagram of the module is shown in

Figure 19-1.The SOSC and RTCC will both remain

running while the device is held in Reset with MCLR

and will continue running after MCLR is released.

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, refer to the

“PIC24F

Family

Reference

Manual”

Section

29.

“Real-Time

Clock

and

Calendar (RTCC)”

(DS39696).

RTCC Prescalers

RTCC Timer

Comparator

Compare Registers

Repeat Counter

YEAR

MTHDY

WKDYHR

MINSEC

ALMTHDY

ALWDHR

ALMINSEC

with Masks

RTCC Interrupt Logic

RCFGCAL

ALCFGRPT

Alarm

Event

32.768 kHz Input

from SOSC Oscillator

0.5s

RTCC Clock Domain

Alarm Pulse

RTCC Interrupt

CPU Clock Domain

RTCVAL

ALRMVAL

RTCC Pin

RTCOE

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