PIC32MX575F256H-80I Datasheet, PDF (139/236 Pages) Microchip Technology – High-Performance, USB, CAN and Ethernet 32-Bit Flash Microcontrollers

PIC32MX5XX/6XX/7XX
21.0 REAL-TIME CLOCK AND
CALENDAR (RTCC)
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) in the “PIC32MX Family
Reference Manual”, which is available
from the Microchip web site
(www.microchip.com/PIC32).
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.
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
intervention. Low-power optimization provides
extended battery lifetime while keeping track of time.
FIGURE 21-1:
RTCC BLOCK DIAGRAM
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
32.768 kHz Input
from Secondary
Oscillator (SOSC)
RTCC Prescalers
0.5s
Alarm
Event
RTCC Timer
Comparator
Compare Registers
with Masks
Repeat Counter
RTCVAL
ALRMVAL
RTCC Interrupt Logic
YEAR, MTH, DAY
WKDAY
HR, MIN, SEC
MTH, DAY
WKDAY
HR, MIN, SEC
RTCC Interrupt
Alarm Pulse
Seconds Pulse
RTCOE
RTCC Pin
 2010 Microchip Technology Inc.
Preliminary
DS61156C-page 139