Microchip Technology MA240029 データシート
2010-2011 Microchip Technology Inc.
DS39996F-page 275
PIC24FJ128GA310 FAMILY
22.0
REAL-TIME CLOCK AND
CALENDAR (RTCC)
CALENDAR (RTCC)
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
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
24-hour format
• Visibility of one half second period
• Provides calendar – weekday, date, month and
• Provides calendar – weekday, date, month and
year
• Alarm-configurable for half a second, one second,
10 seconds, one minute, 10 minutes, one hour,
one day, one week, one month or one year
one day, one week, one month or one year
• Alarm repeat with decrementing counter
• Alarm with indefinite repeat chime
• Year 2000 to 2099 leap year correction
• Alarm with indefinite repeat chime
• Year 2000 to 2099 leap year correction
• 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
• User calibration of the 32.768 kHz clock
crystal/32K INTRC frequency with periodic
auto-adjust
auto-adjust
• Optimized for long term battery operation
• Fractional second synchronization
• Calibration to within ±2.64 seconds error per
• Fractional second synchronization
• Calibration to within ±2.64 seconds error per
month
• Calibrates up to 260 ppm of crystal error
• Ability to periodically wake up external devices
• Ability to periodically wake up external devices
without CPU intervention (external power control)
• Power control output for external circuit control
• Calibration takes effect every 15 seconds
• Runs from any one of the following:
• Calibration takes effect every 15 seconds
• Runs from any one of the following:
- External Real-Time Clock (RTC) of 32.768 kHz
- Internal 31.25 kHz LPRC clock
- 50 Hz or 60 Hz external input
- Internal 31.25 kHz LPRC clock
- 50 Hz or 60 Hz external input
22.1
RTCC Source Clock
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 off system cost, accuracy and power
consumption, based on the overall system needs.
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 off system cost, accuracy and power
consumption, based on the overall system needs.
FIGURE 22-1:
RTCC BLOCK DIAGRAM
Note:
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 Family Reference Manual”
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 Family Reference Manual”
,
Section 29. “Real-Time Clock and
Calendar (RTCC)”
Calendar (RTCC)”
(DS39696).
RTCC Clock Domain
CPU Clock Domain
RTCC
RTCC Prescalers
RTCC Timer
Comparator
Alarm Registers with Masks
Repeat Counter
0.5 Sec
ALRMVAL
RTCVAL
ALCFGRPT
RCFGCAL
Alarm
Event
YEAR
MTHDY
WKDYHR
MINSEC
ALMTHDY
ALWDHR
ALMINSEC
RTCC
Interrupt
Interrupt
RTCOUT<1:0>
RTCOE
10
01
00
Clock Source
1s
Pin
Alarm
Input from
SOSC/LPRC
Oscillator or
SOSC/LPRC
Oscillator or
External Source
RTCC Interrupt Logic
Pulse