PIC18LF8720 Microchip Technology, PIC18LF8720 Datasheet - Page 23
PIC18LF8720
Manufacturer Part Number
PIC18LF8720
Description
(PIC18LF6620/6520/8520/6620/8620/6720/8720) 64/80-Pin High-Performance / 64-Kbyte Enhanced Flash Microcontrollers
Manufacturer
Microchip Technology
Datasheet
1.PIC18LF8720.pdf
(380 pages)
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2.0
2.1
The PIC18FXX20 devices can be operated in eight
different oscillator modes. The user can program three
configuration bits (FOSC2, FOSC1 and FOSC0) to
select one of these eight modes:
1.
2.
3.
4.
5.
6.
7.
8.
2.2
In XT, LP, HS or HS+PLL Oscillator modes, a crystal or
ceramic resonator is connected to the OSC1 and
OSC2 pins to establish oscillation. Figure 2-1 shows
the pin connections.
The PIC18FXX20 oscillator design requires the use of
a parallel cut crystal.
FIGURE 2-1:
2004 Microchip Technology Inc.
Note:
Note 1: See Table 2-1 and Table 2-2 for recommended
LP
XT
HS
HS+PLL
RC
RCIO
EC
ECIO
C1
C2
2: A series resistor (R
3: R
OSCILLATOR
CONFIGURATIONS
Oscillator Types
Crystal Oscillator/Ceramic
Resonators
(1)
(1)
Use of a series cut crystal may give a fre-
quency out of the crystal manufacturer’s
specifications.
values of C1 and C2.
strip cut crystals.
XTAL
F
R
S
varies with the oscillator mode chosen.
(2)
PIC18F6520/8520/6620/8620/6720/8720
with PLL enabled
enabled
Low-Power Crystal
Crystal/Resonator
High-Speed Crystal/Resonator
High-Speed Crystal/Resonator
External Resistor/Capacitor
External Resistor/Capacitor with
I/O pin enabled
External Clock
External Clock with I/O pin
OSC2
OSC1
CRYSTAL/CERAMIC
RESONATOR OPERATION
(HS, XT OR LP
CONFIGURATION)
S
R
) may be required for AT
F
(3)
PIC18FXX20
Sleep
To
Internal
Logic
TABLE 2-1:
These values are for design guidance only.
See notes following this table.
All resonators used did not have built-in capacitors.
16.0 MHz Murata Erie CSA16.00MX
2.0 MHz Murata Erie CSA2.00MG
4.0 MHz Murata Erie CSA4.00MG
8.0 MHz Murata Erie CSA8.00MT
Mode
Note 1: Higher capacitance increases the stability
HS
XT
2: When operating below 3V V
3: Since each resonator/crystal has its own
of the oscillator, but also increases the
start-up time.
using certain ceramic resonators at any
voltage, it may be necessary to use high
gain HS mode, try a lower frequency
resonator, or switch to a crystal oscillator.
characteristics, the user should consult
the resonator/crystal manufacturer for
appropriate
components,
performance.
16.0 MHz
455 kHz
2.0 MHz
4.0 MHz
8.0 MHz
Freq
Resonators Used:
CAPACITOR SELECTION FOR
CERAMIC RESONATORS
Ranges Tested:
68-100 pF
values
15-68 pF
15-68 pF
10-68 pF
10-22 pF
or
C1
verify
DS39609B-page 21
of
DD
68-100 pF
15-68 pF
15-68 pF
10-68 pF
10-22 pF
, or when
oscillator
external
0.5%
0.5%
0.5%
0.5%
C2
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