PIC18F86K90-I/PT Microchip Technology, PIC18F86K90-I/PT Datasheet - Page 228

• Manufacturer Part Number: PIC18F86K90-I/PT
• Description: 64kB Flash, 4kB RAM, 1kB EE, 16MIPS, NanoWatt XLP, LCD, 5V 80 TQFP 12x12x1mm TRA
• Manufacturer: Microchip Technology
• Series: PIC® XLP™ 18Fr

Specifications of PIC18F86K90-I/PT

• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 64MHz
• Connectivity: I²C, LIN, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, LCD, POR, PWM, WDT
• Number Of I /o: 69
• Program Memory Size: 64KB (32K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 1K x 8
• Ram Size: 4K x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Data Converters: A/D 24x12b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 80-TQFP
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

PIC18F87K90 FAMILY
17.2.2
As mentioned earlier, the RTCC module is intended to
be clocked by an external Real-Time Clock (RTCC)
crystal oscillating at 32.768 kHz, but an internal oscillator
can be used. The RTCC clock selection is decided by
the RTCOSC bit (CONFIG3L<0>).
FIGURE 17-4:
17.2.2.1
The RTCC module can be clocked by an external
32.768 kHz crystal (SOSC oscillator), or the LF-INTOSC
oscillator, which can be selected in CONFIG3L<0>.
If the external clock is used, the SOSC oscillator should
be enabled. If LF-INTOSC is providing the clock, the
INTOSC clock can be brought out to the RTCC pin by
the RTSECSEL<1:0> bits (PADCFG<2:1>).
17.2.3
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 17-2.
Because the following values are in BCD format, the
carry to the upper BCD digit occurs at the count of 10,
not 16 (SECONDS, MINUTES, HOURS, WEEKDAY,
DAYS and MONTHS).
DS39957B-page 228
carry to the Day field
Year field
Table 17-1)
use of the RTCC
Note 1:
32.768 kHz XTAL
from SOSC
Internal RC
CONFIG3L<0>
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)
module to yield an error of 3 seconds or less per month.
Day of Week
Calibration of the crystal can be done through this
(For further details, see Section 17.2.9 “Calibration”.)
TABLE 17-1:
TABLE 17-2:
Note 1:
Half Second
Clock
Day
09 (September)
12 (December)
11 (November)
02 (February)
01 (January)
10 (October)
08 (August)
03 (March)
06 (June)
04 (April)
05 (May)
07 (July)
0
Wednesday
Month
.
Thursday
See Section 17.2.4 “Leap Year”.
Saturday
Tuesday
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)