DSPIC33FJ32GP302THSLASHSP datasheet(277/403 Pages) MICROCHIP

277 / 403 page

 2009 Microchip Technology Inc.

Preliminary

DS70292D-page 277

dsPIC33FJ32GP302/304, dsPIC33FJ64GPX02/X04, AND dsPIC33FJ128GPX02/X04

24.0

REAL-TIME CLOCK AND

CALENDAR (RTCC)

This chapter discusses the Real-Time Clock and

Calendar

(RTCC)

module,

available

dsPIC33FJ32GP302/304,

dsPIC33FJ64GPX02/X04,

and

dsPIC33FJ128GPX02/X04

devices,

and

its

operation. The following are some of the key

features of this module:

• Time: hours, minutes, and seconds

• 24-hour format (military time)

• Calendar: weekday, date, month and year

• Alarm configurable

• Year range: 2000 to 2099

• Leap year correction

• BCD format for compact firmware

• Optimized for low-power operation

• User calibration with auto-adjust

• Calibration range: ±2.64 seconds error per month

• Requirements: External 32.768 kHz clock crystal

• Alarm pulse or seconds clock output on RTCC pin

The RTCC module is intended for applications where

accurate time must be maintained for extended periods

of time with minimum to no intervention from the CPU.

The RTCC module is optimized for low-power usage to

provide extended battery lifetime while keeping track of

time.

The RTCC module is a 100-year clock and calendar

with automatic leap year detection. The range of the

clock is from 00:00:00 (midnight) on January 1, 2000 to

23:59:59 on December 31, 2099.

The hours are available in 24-hour (military time)

format. The clock provides a granularity of one second

with half-second visibility to the user.

FIGURE 24-1:

RTCC BLOCK DIAGRAM

Note 1: This data sheet summarizes the features

the

dsPIC33FJ32GP302/304,

dsPIC33FJ64GPX02/X04,

and

dsPIC33FJ128GPX02/X04

families

devices. It is not intended to be a compre-

hensive reference source. To comple-

ment the information in this data sheet,

refer to “Section 37. Real-Time Clock

and

Calendar

(RTCC)”

the

“dsPIC33F/PIC24H

Family

Reference

Manual”, which is available from the

Microchip website (www.microchip.com).

2: Some registers

and

associated bits

described in this section may not be avail-

able on all devices. Refer to Section 4.0

“Memory Organization” in this data

sheet for device-specific register and bit

information.

RTCC Prescalers

RTCC Timer

Comparator

Compare Registers

Repeat Counter

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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