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2002 Microchip Technology Inc.

DS41120B-page 119

PIC16C717/770/771

12.2

Oscillator Configurations

12.2.1

OSCILLATOR TYPES

The PIC16C717/770/771 can be operated in eight dif-

ferent Oscillator modes. The user can program three

configuration bits (FOSC<2:0>) to select one of these

eight modes:

Low Power Crystal

Crystal/Resonator

High Speed Crystal/Resonator

External Resistor (with and without

CLKOUT)

INTRC

Internal 4 MHz (with and without

CLKOUT)

External Clock

12.2.2

LP, XT AND HS MODES

In LP, XT or HS modes, a crystal or ceramic resonator

is connected to the OSC1/CLKIN and OSC2/CLKOUT

pins

establish

oscillation

(Figure 12-1).

The

PIC16C717/770/771 oscillator design requires the use

of a parallel cut crystal. Use of a series cut crystal may

give a frequency out of the crystal manufacturers spec-

ifications.

FIGURE 12-1:

CRYSTAL/CERAMIC

RESONATOR OPERATION

(HS, XT OR LP

OSC CONFIGURATION)

TABLE 12-1:

CERAMIC RESONATORS

TABLE 12-2:

CAPACITOR SELECTION FOR

CRYSTAL OSCILLATOR

12.2.3

EC MODE

In applications where the clock source is external, the

PIC16C717/770/771 should be programmed to select

the EC (External Clock) mode. In this mode, the RA6/

OSC2/CLKOUT pin is available as an I/O pin. See

Figure 12-2 for illustration.

FIGURE 12-2:

EXTERNAL CLOCK INPUT

OPERATION (EC OSC

CONFIGURATION)

Note1:

See Table 12-1 and Table 12-2 for recom-

mended values of C1 and C2.

A series resistor (RS) may be required for

AT strip cut crystals.

RF varies with the Crystal mode chosen.

C1(1)

C2(1)

XTAL

OSC2

OSC1

RF(3)

SLEEP

logic

PIC16C717/770/771

RS(2)

internal

Ranges Tested:

Mode

Freq

OSC1

OSC2

455 kHz

2.0 MHz

4.0 MHz

68 - 100 pF

15 - 68 pF

68 - 100 pF

15 - 68 pF

8.0 MHz

16.0 MHz

10 - 68 pF

10 - 22 pF

10 - 68 pF

10 - 22 pF

These values are for design guidance only. See

notes at bottom of page.

All resonators used did not have built-in capacitors.

Osc Type

Crystal

Freq

Cap. Range

32 kHz

33 pF

200 kHz

15 pF

200 kHz

47-68 pF

1 MHz

15 pF

4 MHz

15 pF

4 MHz

15 pF

8 MHz

15-33 pF

20 MHz

15-33 pF

These values are for design guidance only. See

notes at bottom of page.

Note 1: Since each resonator/crystal has its own

characteristics, the user should consult the

resonator/crystal manufacturer for appropri-

ate values of external components.

2: Higher capacitance increases the stability of

oscillator but also increases the start-up

time.

OSC1

RA6

I/O

Clock from

ext. system

PIC16C717/770/771

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