dspic33fj128mc204 Microchip Technology Inc., dspic33fj128mc204 Datasheet - Page 297

• Manufacturer Part Number: dspic33fj128mc204
• Description: High-performance, 16-bit Digital Signal Controllers
• Manufacturer: Microchip Technology Inc.

25.0
This chapter discusses the Real-Time Clock and
Calendar
dsPIC33FJ32MC302/304, dsPIC33FJ64MCX02/X04,
and dsPIC33FJ128MCX02/X04 devices, and its
operation. Listed below are some of the key features
of this module:
• Time: hours, minutes, and seconds
• 24-hour format (military time)
• Calendar: weekday, date, month, and year
FIGURE 25-1:
© 2009 Microchip Technology Inc.
Note:
32.768 kHz Input
from SOSC Oscillator
REAL-TIME CLOCK AND
CALENDAR (RTCC)
This data sheet summarizes the features
of
dsPIC33FJ64MCX02/X04,
dsPIC33FJ128MCX02/X04
devices. It is not intended to be a
comprehensive
complement the information in this data
sheet, refer to the “dsPIC33F Family
Reference
“Real-Time
(RTCC)”, which is available from the
Microchip website (www.microchip.com).
(RTCC)
the
RTCC BLOCK DIAGRAM
Alarm
Event
Manual”,
module,
Clock
RTCC Clock Domain
dsPIC33FJ32MC302/304,
reference
Compare Registers
RTCC Prescalers
Repeat Counter
RTCC Timer
Comparator
with Masks
and
available
Section
0.5s
families
source.
RTCC Interrupt Logic
Calendar
and
37.
Preliminary
To
of
on
CPU Clock Domain
ALRMVAL
ALCFGRPT
• 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
of time 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.
RCFGCAL
RTCVAL
RTCOE
Alarm Pulse
RTCC Interrupt
DS70291C-page 295
RTCC Pin