MA240029 Microchip Technology, MA240029 Datasheet - Page 275

• Manufacturer Part Number: MA240029
• Description: Daughter Cards & OEM Boards PIC24FJ128GA310 Gen Purpose PIM
• Manufacturer: Microchip Technology

Specifications of MA240029

• Rohs: yes
• Product: Daughter Cards
• Core: PIC
• Description/function: Plug-in module
• Interface Type: I2C, SPI
• Tool Is For Evaluation Of: PIC24FJ128GA310
• For Use With: Explorer 16 Development Board

22.0
The RTCC provides the user with a Real-Time Clock
and Calendar (RTCC) function that can be calibrated.
Key features of the RTCC module are:
• Operates in Deep Sleep mode
• Selectable clock source
• Provides hours, minutes and seconds using
• Visibility of one half second period
• Provides calendar – weekday, date, month and
• Alarm-configurable for half a second, one second,
• Alarm repeat with decrementing counter
• Alarm with indefinite repeat chime
• Year 2000 to 2099 leap year correction
FIGURE 22-1:
 2010-2011 Microchip Technology Inc.
Note:
24-hour format
year
10 seconds, one minute, 10 minutes, one hour,
one day, one week, one month or one year
Input from
SOSC/LPRC
Oscillator or
External Source
REAL-TIME CLOCK AND
CALENDAR (RTCC)
Section 29. “Real-Time Clock and
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 on the
Real-Time Clock and Calendar, refer to the
“PIC24F
Calendar (RTCC)” (DS39696).
Alarm
Event
RTCC Clock Domain
Alarm Registers with Masks
RTCC Prescalers
Repeat Counter
Family
RTCC BLOCK DIAGRAM
RTCC Timer
Comparator
0.5 Sec
Reference
RTCC Interrupt Logic
Manual”,
PIC24FJ128GA310 FAMILY
CPU Clock Domain
ALCFGRPT
RCFGCAL
ALRMVAL
• BCD format for smaller software overhead
• Optimized for long-term battery operation
• User calibration of the 32.768 kHz clock
• Optimized for long term battery operation
• Fractional second synchronization
• Calibration to within ±2.64 seconds error per
• Calibrates up to 260 ppm of crystal error
• Ability to periodically wake up external devices
• Power control output for external circuit control
• Calibration takes effect every 15 seconds
• Runs from any one of the following:
22.1
The user can select between the SOSC crystal
oscillator, LPRC internal oscillator or an external
50 Hz/60 Hz power line input as the clock reference for
the RTCC module. This gives the user an option to
trade
consumption, based on the overall system needs.
RTCVAL
crystal/32K INTRC frequency with periodic
auto-adjust
month
without CPU intervention (external power control)
- External Real-Time Clock (RTC) of 32.768 kHz
- Internal 31.25 kHz LPRC clock
- 50 Hz or 60 Hz external input
off
RTCC Source Clock
Alarm
Pulse
system
RTCC
Interrupt
cost,
Clock Source
accuracy
1s
RTCOE
RTCOUT<1:0>
ALMINSEC
ALMTHDY
WKDYHR
ALWDHR
MINSEC
MTHDY
DS39996F-page 275
YEAR
00
10
01
and
RTCC
Pin
power