Datasheet

 2013-2014 Microchip Technology Inc. DS70000689D-page 383
dsPIC33EPXXXGM3XX/6XX/7XX
27.0 REAL-TIME CLOCK AND
CALENDAR (RTCC)
This chapter discusses the Real-Time Clock and
Calendar (RTCC) module and its operation.
Some of the key features of this module are:
• Time: Hours, Minutes and Seconds
• 24-Hour Format (military time)
• Calendar: Weekday, Date, Month and Year
• Alarm Configurable
• Year Range: 2000 to 2099
• Leap Year Correction
• BCD Format for Compact Firmware
• Optimized for Low-Power Operation
• User Calibration with Auto-Adjust
• Calibration Range: ±2.64 Seconds Error per Month
• Requirements: External 32.768 kHz Clock Crystal
• Alarm Pulse or Seconds Clock Output on RTCC Pin
The RTCC module is intended for applications where
accurate time must be maintained for extended periods
with minimum to no intervention from the CPU. The
RTCC module is optimized for low-power usage to
provide extended battery lifetime while keeping track of
time.
The RTCC module is a 100-year clock and calendar
with automatic leap year detection. The range of the
clock is from 00:00:00 (midnight) on January 1, 2000 to
23:59:59 on December 31, 2099.
The hours are available in 24-hour (military time)
format. The clock provides a granularity of one second
with half-second visibility to the user.
Note 1: This data sheet summarizes the features
of the dsPIC33EPXXXGM3XX/6XX/7XX
families of devices. It is not intended to be
a comprehensive reference source. To
complement the information in this data
sheet, refer to the “dsPIC33/PIC24 Family
Reference Manual”, “Real-Time Clock
and Calendar (RTCC)” (DS70584), which
is available from the Microchip web site
(www.microchip.com).
2: Some registers and associated bits
described in this section may not be
available on all devices. Refer to
Section 4.0 “Memory Organization” in
this data sheet for device-specific register
and bit information.