PIC24HJ128GP802-I/ML View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC24HJ128GP802-I/ML

High-Performance, 16-bit Microcontrollers

Microchip Technology 

PIC24HJ32GP302/304, PIC24HJ64GPX02/X04 AND PIC24HJ128GPX02/X04

22.0 REAL-TIME CLOCK AND

CALENDAR (RTCC)

Note 1: This data sheet summarizes the features

of

the

PIC24HJ32GP302/304,

PIC24HJ64GPX02/X04

and

PIC24HJ128GPX02/X04 families of

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)” (DS70310) of 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.

This chapter discusses the Real-Time Clock and

Calendar (RTCC) module, available on

PIC24HJ32GP302/304, PIC24HJ64GPX02/X04 and

PIC24HJ128GPX02/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 22-1:

RTCC BLOCK DIAGRAM

RTCC Clock Domain

32.768 kHz Input

from SOSC Oscillator

RTCC Prescalers

0.5s

Alarm

Event

RTCC Timer

Comparator

Compare Registers

with Masks

Repeat Counter

CPU Clock Domain

RCFGCAL

ALCFGRPT

RTCVAL

ALRMVAL

RTCC Interrupt Logic

RTCC Interrupt

Alarm Pulse

RTCOE

RTCC Pin

© 2009 Microchip Technology Inc.

Preliminary

DS70293D-page 239

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