PIC18F-LF1XK50 MICROCHIP [Microchip Technology], PIC18F-LF1XK50 Datasheet - Page 17
PIC18F-LF1XK50
Manufacturer Part Number
PIC18F-LF1XK50
Description
20-Pin USB Flash Microcontrollers
Manufacturer
MICROCHIP [Microchip Technology]
Datasheet
1.PIC18F-LF1XK50.pdf
(420 pages)
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2.3.1
The Primary External Oscillator can be enabled or dis-
abled via software. To enable software control of the
Primary External Oscillator, the PCLKEN bit of the
CONFIG1H Configuration register must be set. With
the PCLKEN bit set, the Primary External Oscillator is
controlled by the PRI_SD bit of the OSCCON2 register.
The Primary External Oscillator will be enabled when
the PRI_SD bit is set, and disabled when the PRI_SD
bit is clear.
2.3.2
The LP, XT and HS modes support the use of quartz
crystal resonators or ceramic resonators connected to
OSC1 and OSC2
medium or high gain setting of the internal inverter-
amplifier to support various resonator types and speed.
LP Oscillator mode selects the lowest gain setting of the
internal inverter-amplifier. LP mode current consumption
is the least of the three modes. This mode is best suited
to drive resonators with a low drive level specification, for
example, tuning fork type crystals.
XT Oscillator mode selects the intermediate gain
setting of the internal inverter-amplifier. XT mode
current consumption is the medium of the three modes.
This mode is best suited to drive resonators with a
medium drive level specification.
HS Oscillator mode selects the highest gain setting of the
internal inverter-amplifier. HS mode current consumption
is the highest of the three modes. This mode is best
suited for resonators that require a high drive setting.
Figure 2-2
quartz crystal and ceramic resonators, respectively.
2010 Microchip Technology Inc.
Note:
and
PRIMARY EXTERNAL OSCILLATOR
SHUT-DOWN
The Primary External Oscillator cannot be
shut down when it is selected as the
System Clock. To shut down the oscillator,
the system clock source must be either
the Secondary Oscillator or the Internal
Oscillator.
LP, XT AND HS OSCILLATOR
MODES
Figure 2-3
(Figure
2-2). The mode selects a low,
show typical circuits for
Preliminary
FIGURE 2-2:
Note 1: A series resistor (R
Note 1: Quartz
C1
C2
2: The value of R
2: Always verify oscillator performance over
3: For oscillator design assistance, reference
PIC18F/LF1XK50
quartz crystals with low drive level.
selected (typically between 2 M to 10 M.
• AN826, “Crystal Oscillator Basics and
• AN849, “Basic PIC
• AN943, “Practical PIC
• AN949, “Making Your Oscillator Work”
according
manufacturer. The user should consult the
manufacturer data sheets for specifications
and recommended application.
the V
expected for the application.
the following Microchip Applications Notes:
Crystal Selection for rfPIC
Devices” (DS00826)
(DS00849)
Analysis and Design” (DS00943)
(DS00949)
Quartz
Crystal
R
S
DD
(1)
and temperature range that is
crystal
QUARTZ CRYSTAL
OPERATION (LP, XT OR
HS MODE)
F
to
varies with the Oscillator mode
OSC1/CLKIN
OSC2/CLKOUT
R
S
type,
F
) may be required for
(2)
®
characteristics
PIC
Oscillator Design”
®
Oscillator
®
DS41350E-page 17
MCU
®
package
and PIC
Sleep
To Internal
Logic
®
vary
and
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