PIC32MX795F512LT-80ISLASHPF datasheet(151/256 Pages) MICROCHIP

151 / 256 page

DS61156G-page 151

PIC32MX5XX/6XX/7XX

21.0 REAL-TIME CLOCK AND

CALENDAR (RTCC)

The PIC32 RTCC module is intended for applications

in which accurate time must be maintained for

extended periods of time with minimal or no CPU

intervention.

Low-power

optimization

provides

extended battery lifetime while keeping track of time.

A simplified block diagram of the RTCC module is

illustrated in Figure 21-1.

Following are some of the key features of this module:

• Time: hours, minutes and seconds

• 24-hour format (military time)

• Visibility of one-half second period

• Provides calendar: Weekday, date, month and

year

• Alarm intervals are configurable for half of a

second, one second, 10 seconds, one minute, 10

minutes, one hour, one day, one week, one month

and one year

• Alarm repeat with decrementing counter

• Alarm with indefinite repeat: Chime

• Year range: 2000 to 2099

• Leap year correction

• BCD format for smaller firmware overhead

• Optimized for long-term battery operation

• Fractional second synchronization

• User calibration of the clock crystal frequency with

auto-adjust

• Calibration range:

±0.66 seconds error per month

• Calibrates up to 260 ppm of crystal error

• Requirements: External 32.768 kHz clock crystal

• Alarm pulse or seconds clock output on

RTCC pin

FIGURE 21-1:

RTCC BLOCK DIAGRAM

Note 1:

This data sheet summarizes the features

of the PIC32MX5XX/6XX/7XX family of

devices. It is not intended to be a

comprehensive reference source. To

complement the information in this data

sheet, refer to Section 29. “Real-Time

Clock

and

Calendar

(RTCC)”

(DS61125)

the

“PIC32

Family

Reference Manual”

, which is available

from

the

Microchip

web

site

(www.microchip.com/PIC32).

Some registers and associated bits

described in this section may not be

available on all devices. Refer to

Section 4.0 “Memory Organization”

this data sheet for device-specific register

and bit information.

Seconds Pulse

RTCC Prescalers

RTCC Timer

Comparator

Compare Registers

Repeat Counter

YEAR, MTH, DAY

WKDAY

HR, MIN, SEC

MTH, DAY

WKDAY

HR, MIN, SEC

with Masks

RTCC Interrupt Logic

Alarm

Event

32.768 kHz Input

from Secondary

0.5s

Alarm Pulse

RTCC Interrupt

RTCVAL

ALRMVAL

RTCC Pin

RTCOE

Oscillator (SOSC)

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