PIC16C65A Microchip Technology, PIC16C65A Datasheet - Page 125

• Manufacturer Part Number: PIC16C65A
• Description: 8-Bit CMOS Microcontrollers
• Manufacturer: Microchip Technology

13.2
13.2.1
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
13.2.2
In LP, XT, or HS modes a crystal or ceramic resonator
is connected to the OSC1/CLKIN and OSC2/CLKOUT
pins
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).
Applicable Devices
61 62 62A R62 63 R63 64 64A R64 65 65A R65 66 67
1997 Microchip Technology Inc.
to
Oscillator Configurations
CRYSTAL OSCILLATOR/CERAMIC
RESONATORS
OSCILLATOR TYPES
establish
Low Power Crystal
Crystal/Resonator
High Speed Crystal/Resonator
Resistor/Capacitor
oscillation
(Figure 13-4). The
FIGURE 13-4: CRYSTAL/CERAMIC
FIGURE 13-5: EXTERNAL CLOCK INPUT
See Table 13-1, Table 13-3, Table 13-2 and Table 13-4 for
recommended values of C1 and C2.
Note 1: A series resistor may be required for AT strip
Clock from
ext. system
2: For the PIC16C61 the buffer is on the OSC2
C1
C2
cut crystals.
pin, all other devices have the buffer on the
OSC1 pin.
Open
Note1
XTAL
RS
RESONATOR OPERATION
(HS, XT OR LP OSC
CONFIGURATION)
OPERATION (HS, XT OR LP
OSC CONFIGURATION)
OSC1
OSC2
PIC16C6X
OSC1
OSC2
R
F
DS30234D-page 125
PIC16CXX
(2)
(2)
SLEEP
PIC16CXX
To internal
logic
To internal
logic