PIC16CR67-20E/SO View Datasheet(PDF) - Microchip Technology
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Description
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PIC16CR67-20E/SO Datasheet PDF : 336 Pages
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13.2 Oscillator Configurations
Applicable Devices
61 62 62A R62 63 R63 64 64A R64 65 65A R65 66 67
13.2.1 OSCILLATOR TYPES
The PIC16CXX can be operated in four different oscil-
lator modes. The user can program two configuration
bits (FOSC1 and FOSC0) to select one of these four
modes:
• LP
• XT
• HS
• RC
Low Power Crystal
Crystal/Resonator
High Speed Crystal/Resonator
Resistor/Capacitor
13.2.2 CRYSTAL OSCILLATOR/CERAMIC
RESONATORS
In LP, XT, or HS modes a crystal or ceramic resonator
is connected to the OSC1/CLKIN and OSC2/CLKOUT
pins to establish oscillation (Figure 13-4). The
PIC16CXX oscillator design requires the use of a par-
allel cut crystal. Use of a series cut crystal may give a
frequency out of the crystal manufacturers specifica-
tions. When in LP, XT, or HS modes, the device can
have an external clock source to drive the OSC1/CLKIN
pin (Figure 13-5).
PIC16C6X
FIGURE 13-4: CRYSTAL/CERAMIC
RESONATOR OPERATION
(HS, XT OR LP OSC
CONFIGURATION)
OSC1
C1
(2)
To internal
logic
XTAL
RF
OSC2
SLEEP
PIC16CXX
RS
C2 Note1
(2)
To internal
logic
See Table 13-1, Table 13-3, Table 13-2 and Table 13-4 for
recommended values of C1 and C2.
Note 1:
2:
A series resistor may be required for AT strip
cut crystals.
For the PIC16C61 the buffer is on the OSC2
pin, all other devices have the buffer on the
OSC1 pin.
FIGURE 13-5: EXTERNAL CLOCK INPUT
OPERATION (HS, XT OR LP
OSC CONFIGURATION)
Clock from
ext. system
Open
OSC1
PIC16CXX
OSC2
© 1997 Microchip Technology Inc.
DS30234D-page 125
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