PIC16C65B Microchip Technology Inc., PIC16C65B Datasheet - Page 86

• Manufacturer Part Number: PIC16C65B
• Description: 8-bit Cmos Microcontrollers With A/d Converter
• Manufacturer: Microchip Technology Inc.

PIC16C63A/65B/73B/74B
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 XT, LP, or HS modes, a crystal or ceramic resonator
is connected to the OSC1/CLKIN and OSC2/CLKOUT
pins to establish
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 XT, LP or HS modes, the device can
have an external clock source to drive the OSC1/
CLKIN pin (Figure 13-2). See the PICmicro™ Mid-
Range MCU Reference Manual (DS33023) for details
on building an external oscillator.
DS30605C-page 86
Oscillator Configurations
Low Power Crystal
Crystal/Resonator
High Speed Crystal/Resonator
Resistor/Capacitor
CRYSTAL OSCILLATOR/CERAMIC
RESONATORS
OSCILLATOR TYPES
oscillation (Figure 13-1).
The
FIGURE 13-1:
FIGURE 13-2:
See Table 13-1 and Table 13-2 for recommended values of C1
and C2.
Note 1: A series resistor may be required for AT strip cut crystals.
Clock from
ext. system
C1
C2
Open
(Note 1)
XTAL
RS
OSC1
OSC2
CRYSTAL/CERAMIC
RESONATOR OPERATION
(HS, XT OR LP
OSC CONFIGURATION)
EXTERNAL CLOCK INPUT
OPERATION (HS, XT OR
LP OSC CONFIGURATION)
2000 Microchip Technology Inc.
OSC1
OSC2
R
F
PIC16CXX
SLEEP
PIC16CXX
To internal
logic