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PIC32MX3XX/4XX
21.0 REAL-TIME CLOCK AND
CALENDAR (RTCC)
Note 1: This data sheet summarizes the features
of the PIC32MX3XX/4XX family 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 29. “Real-Time Clock
and Calendar (RTCC)” (DS61125) of
the “PIC32MX Family Reference Man-
ual” , which is available from the Microchip
The 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
web site (www.microchip.com/PIC32).
2: Some registers and associated bits
described in this section may not be avail-
“Memory Organization” in this data
sheet for device-specific register and bit
information.
The PIC32MX RTCC module is intended for applica-
tions in which accurate time must be maintained for
extended periods of time with minimal or no CPU inter-
vention. Low-power optimization provides extended
battery lifetime while keeping track of time.
FIGURE 21-1:
RTCC BLOCK DIAGRAM
32.768 kHz Input
from Secondary
RTCC Prescalers
Oscillator (S OSC )
0.5s
?
?
?
?
?
?
?
?
?
?
?
?
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
YEAR, MTH, DAY
RTCC Timer
RTCVAL
WKDAY
Alarm
Event
Comparator
HR, MIN, SEC
MTH, DAY
Compare Registers
with Masks
ALRMVAL
WKDAY
HR, MIN, SEC
Repeat Counter
RTCC Interrupt
RTCC Interrupt Logic
Alarm Pulse
? 2010 Microchip Technology Inc.
Seconds Pulse
RTCOE
RTCC Pin
DS61143G-page 121
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