PIC24F32KA302-ISLASHML datasheet(185/364 Pages) MICROCHIP

185 / 364 page

 2011-2013 Microchip Technology Inc.

DS39995D-page 185

PIC24FV32KA304 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

• Optimized for long-term battery operation

• Fractional second synchronization

• Calibration to within ±2.64 seconds error per

month

• Calibrates up to 260 ppm of crystal error

• Ability to periodically wake-up external devices

without CPU intervention (external power control)

• Power control output for external circuit control

• Calibration takes effect every 15 seconds

• Runs from any one of the following:

- External Real-Time Clock of 32.768 kHz

- Internal 31.25 kHz LPRC Clock

- 50 Hz or 60 Hz External Input

19.1

RTCC Source Clock

The user can select between the SOSC crystal

oscillator, LPRC internal oscillator or an external

50 Hz/60 Hz power line input as the clock reference for

the RTCC module. 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

RTCOUT<1:0>

RTCOE

Clock Source

Alarm Pulse

Input from

SOSC/LPRC

Oscillator or

External Source

PIC24F32KA302-I/ML Datasheet(PDF) 185 Page - Microchip Technology

PIC24F32KA302-I/ML Datasheet(HTML) 185 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL