PIC18F85K22-I/PT Microchip Technology, PIC18F85K22-I/PT Datasheet - Page 238

• Manufacturer Part Number: PIC18F85K22-I/PT
• Description: IC, 8BIT MCU, PIC18F, 64MHZ, TQFP-80
• Manufacturer: Microchip Technology
• Series: PIC® XLP™ 18Fr

Specifications of PIC18F85K22-I/PT

• Controller Family/series: PIC18
• No. Of I/o's: 69
• Eeprom Memory Size: 1KB
• Ram Memory Size: 2KB
• Cpu Speed: 64MHz
• No. Of Timers: 8
• Core Size: 8 Bit
• Program Memory Size: 32KB
• Core Processor: PIC
• Speed: 64MHz
• Connectivity: EBI/EMI, I²C, LIN, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, LVD, POR, PWM, WDT
• Number Of I /o: 69
• Program Memory Type: FLASH
• Eeprom Size: 1K x 8
• Ram Size: 2K 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

PIC18F87K22 FAMILY
18.2.2
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 18-4:
18.2.2.1
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>).
18.2.3
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).
DS39960D-page 238
carry to the Day field
Year field
Table
use of the RTCC
Note 1:
32.768 kHz XTAL
from SOSC
Internal RC
RTCCFG
18-1)
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
Hour:Minute
Table
1:16384
18-2.
(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
TABLE 18-1:
TABLE 18-2:
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
Saturday
Tuesday
Monday
See
Sunday
Friday
Half Second
Section 18.2.4 “Leap
DAY OF WEEK SCHEDULE
DAY TO MONTH ROLLOVER
SCHEDULE
 2009-2011 Microchip Technology Inc.
Day of Week
Month
Section 18.2.9
(1)
Maximum Day Field
One Second Clock
28 or 29
“Calibration”.)
Year”.
31
31
30
31
30
31
31
30
31
30
31
Year
0
1
2
3
4
5
6
(1)