PIC18F25J50 MICROCHIP [Microchip Technology], PIC18F25J50 Datasheet - Page 240

• Manufacturer Part Number: PIC18F25J50
• Description: 28/44-Pin, Low-Power, High-Performance USB Microcontrollers with nanoWatt XLP Technology
• Manufacturer: MICROCHIP [Microchip Technology]

PIC18F46J50 FAMILY
TABLE 17-3:
The Alarm Value register window (ALRMVALH and
ALRMVALL) uses the ALRMPTR bits (ALRMCFG<1:0>)
to select the desired Alarm register pair.
By reading or writing to the ALRMVALH register, the
Alarm Pointer value, ALRMPTR<1:0>, decrements
by 1 until it reaches ‘00’. Once it reaches ‘00’, the
ALRMMIN and ALRMSEC value will be accessible
through ALRMVALH and ALRMVALL until the pointer
value is manually changed.
TABLE 17-4:
17.2.9
The real-time crystal input can be calibrated using the
periodic auto-adjust feature. When properly calibrated,
the RTCC can provide an error of less than three
seconds per month.
To perform this calibration, find the number of error
clock pulses and store the value in the lower half of the
RTCCAL register. The 8-bit, signed value – loaded into
RTCCAL – is multiplied by ‘4’ and will either be added
or subtracted from the RTCC timer, once every minute.
DS39931D-page 240
ALRMPTR<1:0>
RTCPTR<1:0>
00
01
10
11
00
01
10
11
CALIBRATION
RTCVALH AND RTCVALL
REGISTER MAPPING
ALRMVAL REGISTER
MAPPING
ALRMVAL<15:8> ALRMVAL<7:0>
RTCVAL<15:8>
RTCC Value Register Window
Alarm Value Register Window
ALRMMNTH
WEEKDAY
MINUTES
ALRMMIN
ALRMWD
MONTH
—
—
RTCVAL<7:0>
SECONDS
ALRMSEC
ALRMDAY
ALRMHR
HOURS
YEAR
DAY
—
To calibrate the RTCC module:
1.
2.
EQUATION 17-1:
3.
Writes to the RTCCAL register should occur only when
the timer is turned off, or immediately after the rising
edge of the seconds pulse.
Note:
(Ideal Frequency (32,768) – Measured Frequency) *
60 = Error Clocks per Minute
Use another timer resource on the device to find
the error of the 32.768 kHz crystal.
Convert the number of error clock pulses per
minute (see
• If the oscillator is faster than ideal (negative
• If the oscillator is slower than ideal (positive
Load the RTCCAL register with the correct
value.
result from Step 2), the RCFGCALL register
value needs to be negative. This causes the
specified number of clock pulses to be
subtracted from the timer counter once every
minute.
result from Step 2), the RCFGCALL register
value needs to be positive. This causes the
specified number of clock pulses to be added to
the timer counter once every minute.
In determining the crystal’s error value, it
is the user’s responsibility to include the
crystal’s initial error from drift due to
temperature or crystal aging.
Equation
CONVERTING ERROR
CLOCK PULSES
 2011 Microchip Technology Inc.
17-1).