PIC16F684-ISL Microchip Technology Inc., PIC16F684-ISL Datasheet - Page 23

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PIC16F684-ISL

Manufacturer Part Number
PIC16F684-ISL
Description
Manufacturer
Microchip Technology Inc.
Datasheets

Specifications of PIC16F684-ISL

Case
N/A
Notes
NEW
Date_code
11+
3.3.3
LP, XT, HS MODES
The LP, XT and HS modes support the use of quartz
crystal resonators or ceramic resonators connected to
the OSC1 and OSC2 pins (Figure 3-1). The mode
selects a low, 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 con-
sumption 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,
low-frequency/AT-cut quartz crystal resonators.
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, for example, high-frequency/AT-cut
quartz crystal resonators or ceramic resonators.
Figure 3-3 and Figure 3-4 show typical circuits for
quartz crystal and ceramic resonators, respectively.
FIGURE 3-3:
QUARTZ CRYSTAL
OPERATION (LP, XT OR
HS MODE)
PIC16F684
OSC1
C1
Quartz
F (2)
R
Crystal
OSC2
S (1)
R
C2
Note 1: A series resistor (R
) may be required for
S
quartz crystals with low drive level.
2: The value of R
varies with the Oscillator
F
mode selected (typically between 2 M
10 M
.
Note 1: Quartz
crystal
characteristics
according to type, package and manufac-
turer. The user should consult the manu-
facturer data sheets for specifications and
recommended application.
2: Always verify oscillator performance over
the V
and temperature range that is
DD
expected for the application.
 2004 Microchip Technology Inc.
FIGURE 3-4:
C1
C2 Ceramic
Resonator
Note 1: A series resistor (R
for
example,
ceramic resonators with low drive level.
2: The value of R
mode selected (typically between 2 M
10 M
3: An additional parallel feedback resistor (R
may be required for proper ceramic resonator
operation (typical value 1 M ).
To Internal
Logic
Sleep
to
vary
Preliminary
PIC16F684
CERAMIC RESONATOR
OPERATION
(XT OR HS MODE)
PIC16F684
OSC1
To Internal
Logic
Sleep
P (3)
F (2)
R
R
OSC2
S (1)
R
) may be required for
S
varies with the Oscillator
F
to
.
)
P
DS41202C-page 21

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