PIC18F86J72-I/PT Microchip Technology, PIC18F86J72-I/PT Datasheet - Page 150

• Manufacturer Part Number: PIC18F86J72-I/PT
• Description: IC PIC MCU 8BIT 14KB FLSH 80TQFP
• Manufacturer: Microchip Technology
• Series: PIC® 18Fr

Specifications of PIC18F86J72-I/PT

• Program Memory Type: FLASH
• Program Memory Size: 64KB (32K x 16)
• Package / Case: 80-TQFP
• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 48MHz
• Connectivity: I²C, LIN, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, LCD, LVD, POR, PWM, WDT
• Number Of I /o: 51
• Ram Size: 3.8K x 8
• Voltage - Supply (vcc/vdd): 2 V ~ 3.6 V
• Data Converters: A/D 12x12b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Data Bus Width: 8 bit
• Data Ram Size: 4 KB
• Interface Type: SPI, USART, SPI, I2C
• Maximum Clock Frequency: 8 MHz
• Number Of Programmable I/os: 51
• Number Of Timers: 4
• Operating Supply Voltage: 2 V to 3.6 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 14
• Controller Family/series: PIC18F
• No. Of I/o's: 51
• Ram Memory Size: 3923Byte
• Cpu Speed: 12MIPS
• No. Of Timers: 4
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

PIC18F87J72 FAMILY
15.2.2
As mentioned earlier, the RTCC module is intended to
be clocked by an external Real-Time Clock crystal
oscillating at 32.768 kHz, but can also be an internal
oscillator. The RTCC clock selection is decided by the
RTCOSC bit (CONFIG3L<1>).
FIGURE 15-4:
15.2.2.1
The RTCC module can be clocked by an external,
32.768 kHz crystal (Timer1 oscillator) or the internal RC
oscillator, which can be selected in CONFIG3L<1>.
If the external clock is used, the Timer1 oscillator
should be enabled by setting the T1OSCEN bit
(T1CON<3> = 1). If INTRC is providing the clock, the
INTRC clock can be brought out to the RTCC pin by the
RTSECSEL<1:0> bits in the PADCFG register.
15.2.3
This section explains which timer values are affected
when there is a rollover.
• Time of Day: from 23:59:59 to 00:00:00 with a
• Month: from 12/31 to 01/01 with a carry to the
• Day of Week: from 6 to 0 with no carry (see
• Year Carry: from 99 to 00; this also surpasses the
For the day to month rollover schedule, see Table 15-2.
Considering that the following values are in BCD for-
mat, the carry to the upper BCD digit will occur at a
count of 10 and not at 16 (SECONDS, MINUTES,
HOURS, WEEKDAY, DAYS and MONTHS).
DS39979A-page 150
32.768 kHz XTAL
from SOSC
Internal RC
CONFIG 3L<1>
carry to the Day field
Year field
Table 15-1)
use of the RTCC
Note 1:
CLOCK SOURCE
DIGIT CARRY RULES
Real-Time Clock Enable
Writing to the lower half of the MINSEC register resets all counters, allowing fraction of a second
synchronization; clock prescaler is held in Reset when RTCEN =
CLOCK SOURCE MULTIPLEXING
Second
Clock Prescaler
Hour:Minute
1:16384
Preliminary
(1)
Day of Week
Calibration of the crystal can be done through this mod-
ule to yield an error of 3 seconds or less per month.
(For further details, see Section 15.2.9 “Calibration”.)
TABLE 15-1:
TABLE 15-2:
Half-Second
Note 1:
Clock
Day
09 (September)
11 (November)
12 (December)
02 (February)
01 (January)
10 (October)
08 (August)
03 (March)
06 (June)
04 (April)
05 (May)
07 (July)
Wednesday
Month
Thursday
0
Saturday
Tuesday
See Section 15.2.4 “Leap Year”.
Monday
Sunday
.
Friday
Half Second
DAY OF WEEK SCHEDULE
DAY TO MONTH ROLLOVER
SCHEDULE
Day of Week
Month
 2010 Microchip Technology Inc.
(1)
Maximum Day Field
One-Second Clock
28 or 29
31
31
30
31
30
31
31
30
31
30
31
Year
0
1
2
3
4
5
6
(1)