PIC18C658 MICROCHIP [Microchip Technology], PIC18C658 Datasheet - Page 21
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PIC18C658
Manufacturer Part Number
PIC18C658
Description
High-Performance Microcontrollers with CAN Module
Manufacturer
MICROCHIP [Microchip Technology]
Datasheet
1.PIC18C658.pdf
(366 pages)
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2.0
2.1
The PIC18CXX8 can be operated in one of eight oscil-
lator modes, programmable by three configuration bits
(FOSC2, FOSC1, and FOSC0).
1.
2.
3.
4.
5.
6.
7.
8.
2.2
In XT, LP, HS or HS4 (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. An external clock source may also
be connected to the OSC1 pin, as shown in Figure 2-3
and Figure 2-4.
The PIC18CXX8 oscillator design requires the use of a
parallel cut crystal.
2000 Microchip Technology Inc.
Note:
LP
XT
HS
HS4
RC
RCIO
EC
ECIO
OSCILLATOR
CONFIGURATIONS
Oscillator Types
Crystal Oscillator/Ceramic
Resonators
Use of a series cut crystal may give a fre-
quency out of the crystal manufacturer’s
specifications.
Low Power Crystal
Crystal/Resonator
High Speed Crystal/Resonator
High Speed Crystal/Resonator with
PLL enabled
External Resistor/Capacitor
External Resistor/Capacitor with I/O
pin enabled
External Clock
External Clock with I/O pin enabled
Advanced Information
FIGURE 2-1:
Note 1: See Table 2-1 and Table 2-2 for recom-
C1
C2
2: A series resistor (R
3: R
(1)
(1)
mended values of C1 and C2.
for AT strip cut crystals.
F
XTAL
R
varies with the crystal chosen.
S
(2)
CRYSTAL/CERAMIC
RESONATOR OPERATION
(HS, XT OR LP
OSC CONFIGURATION)
OSC2
OSC1
PIC18CXX8
R
F
S
) may be required
(3)
DS30475A-page 21
SLEEP
PIC18CXX8
To
internal
logic
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