MA180025 Microchip Technology, MA180025 Datasheet - Page 39

• Manufacturer Part Number: MA180025
• Description: MODULE PLUG-IN PIC18F87J90 PIM
• Manufacturer: Microchip Technology
• Series: PIC®r

Specifications of MA180025

• Accessory Type: Plug-In Module (PIM) - PIC18F87J90
• Product: Microcontroller Modules
• Silicon Manufacturer: Microchip
• Core Architecture: PIC
• Core Sub-architecture: PIC18
• Silicon Core Number: PIC18F
• Silicon Family Name: PIC18FxxJxx
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: PICDEM LCD 2 Demonstration Board (DM163030)
• For Use With: DM163030 - KIT DEV PICDEM LCD2
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

3.4
3.4.1
In HS or HSPLL Oscillator modes, a crystal or ceramic
resonator is connected to the OSC1 and OSC2 pins to
establish
connections.
The oscillator design requires the use of a crystal rated
for parallel resonant operation.
TABLE 3-1:
 2010 Microchip Technology Inc.
Capacitor values are for design guidance only.
Different capacitor values may be required to produce
acceptable oscillator operation. The user should test
the performance of the oscillator over the expected
V
to the following application notes for oscillator specific
information:
• AN588, “PIC
• AN826, “Crystal Oscillator Basics and Crystal
• AN849, “Basic PIC
• AN943, “Practical PIC
• AN949, “Making Your Oscillator Work”
See the notes following Table 3-2 for additional
information.
Note:
DD
Mode
Guide”
Selection for rfPIC
Design”
HS
and temperature range for the application. Refer
External Oscillator Modes
Typical Capacitor Values Used:
oscillation.
CRYSTAL OSCILLATOR/CERAMIC
RESONATORS (HS MODES)
Use of a crystal rated for series resonant
operation may give a frequency out of the
crystal manufacturer’s specifications.
16.0 MHz
8.0 MHz
Freq.
®
Microcontroller Oscillator Design
CAPACITOR SELECTION FOR
CERAMIC RESONATORS
®
®
and PIC
Oscillator Design”
Figure 3-2
®
Oscillator Analysis and
OSC1
27 pF
22 pF
®
Devices”
shows
OSC2
27 pF
22 pF
the
pin
PIC18F87J90 FAMILY
TABLE 3-2:
FIGURE 3-2:
Capacitor values are for design guidance only.
Different capacitor values may be required to produce
acceptable oscillator operation. The user should test
the performance of the oscillator over the expected
V
Refer to the Microchip application notes cited in
Table 3-1 for oscillator specific information. Also see
the
information.
Osc Type
DD
Note 1: See Table 3-1 and Table 3-2 for initial values of
Note 1: Higher capacitance increases the stability
HS
and temperature range for the application.
notes
C1
C2
2: A series resistor (R
3: R
2: Since each resonator/crystal has its own
3: Rs may be required to avoid overdriving
4: Always verify oscillator performance over
(1)
(1)
C1 and C2.
strip cut crystals.
of oscillator but also increases the start-up
time.
characteristics, the user should consult
the resonator/crystal manufacturer for
appropriate
components.
crystals with low drive level specification.
the V
expected for the application.
F
following
20 MHz
XTAL
varies with the oscillator mode chosen.
Crystal
4 MHz
8 MHz
Freq.
R
CAPACITOR SELECTION FOR
CRYSTAL OSCILLATOR
DD
S
(2)
OSC1
OSC2
and temperature range that is
CRYSTAL/CERAMIC
RESONATOR OPERATION
(HS OR HSPLL
CONFIGURATION)
this
Typical Capacitor Values
values
S
27 pF
22 pF
15 pF
) may be required for AT
R
C1
table
F
PIC18F87J90
(3)
Tested:
DS39933D-page 39
for
of
Sleep
additional
27 pF
22 pF
15 pF
external
To
Internal
Logic
C2