PIC24FJ256DA210 Datasheet, PDF (285/408 Pages) Microchip Technology – 64/100-Pin, 16-Bit Flash Microcontrollers with Graphics Controller and USB On-The-Go (OTG)

PIC24FJ256DA210 FAMILY
20.0 REAL-TIME CLOCK AND
CALENDAR (RTCC)
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). The
information in this data sheet
supersedes the information in the FRM.
The Real-Time Clock and Calendar (RTCC) provides a
function that can be calibrated.
Key features of the RTCC module are:
• Operates in Sleep mode
• Provides hours, minutes and seconds using
24-hour format
• Visibility of half of one 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
- Calibration to within ±2.64 seconds error per
month
- Calibrates up to 260 ppm of crystal error
FIGURE 20-1:
RTCC BLOCK DIAGRAM
32.768 kHz Input
from SOSC
RTCC Clock Domain
RTCC Prescalers
0.5s
Alarm
Event
RTCC Timer
Comparator
Compare Registers
with Masks
Repeat Counter
CPU Clock Domain
RCFGCAL
ALCFGRPT
RTCVAL
ALRMVAL
YEAR
MTHDY
WKDYHR
MINSEC
ALMTHDY
ALWDHR
ALMINSEC
RTCC Interrupt Logic
RTCC Interrupt
Alarm Pulse
RTCOE
RTCC Pin
 2010 Microchip Technology Inc.
DS39969B-page 285