PIC18F65K90T-I/MR Microchip Technology, PIC18F65K90T-I/MR Datasheet - Page 230

• Manufacturer Part Number: PIC18F65K90T-I/MR
• Description: 32kB Flash, 2kB RAM, 1kB EE, NanoWatt XLP, LCD 64 QFN 9x9x0.9mm T/R
• Manufacturer: Microchip Technology
• Series: PIC® XLP™ 18Fr

Specifications of PIC18F65K90T-I/MR

• Processor Series: PIC18F
• Core: PIC
• Data Bus Width: 8 bit
• Program Memory Type: Flash
• Program Memory Size: 32 KB
• Data Ram Size: 2 KB
• Interface Type: I2C, SPI
• Maximum Clock Frequency: 64 MHz
• Number Of Timers: 8
• Operating Supply Voltage: 1.8 V to 5.5 V
• Maximum Operating Temperature: + 125 C
• 3rd Party Development Tools: 52715-96, 52716-328, 52717-734, 52712-325, EWPIC18
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 12 bit, 16 Channel
• 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: 53
• Eeprom Size: 1K x 8
• Ram Size: 2K x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Data Converters: A/D 16x12b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-VFQFN Exposed Pad
• Lead Free Status / Rohs Status: Details

PIC18F87K90 FAMILY
17.2.2
As previously mentioned, the RTCC module is intended
to be clocked by an external Real-Time Clock (RTC)
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 via the SOSCGO bit (OSCCON2<3>). If
LF-INTOSC is providing the clock, the INTOSC clock
can be brought out to the RTCC pin by the RTSEC-
SEL<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
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).
DS39957D-page 230
carry to the Day field
Year field
Table
use of the RTCC
32.768 kHz XTAL
from SOSC
Internal RC
CONFIG3L<0>
Note 1:
17-1)
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 = 0.
CLOCK SOURCE MULTIPLEXING
Second
Clock Prescaler
Table
Hour:Minute
1:16384
17-2.
(1)
module to yield an error of 3 seconds or less per month.
Calibration of the crystal can be done through this
(For further details, see
TABLE 17-1:
TABLE 17-2:
Day of Week
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)
Wednesday
Month
Thursday
See
Saturday
Tuesday
Monday
Sunday
Friday
Section 17.2.4 “Leap
Half Second
DAY OF WEEK SCHEDULE
DAY-TO-MONTH ROLLOVER
SCHEDULE
 2009-2011 Microchip Technology Inc.
Day of Week
Month
Section 17.2.9
(1)
Maximum Day Field
One Second Clock
28 or 29
Year”.
“Calibration”.)
31
31
30
31
30
31
31
30
31
30
31
Year
0
1
2
3
4
5
6
(1)