PIC16LC712-04SLASHSS datasheet(53/108 Pages) MICROCHIP

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Preliminary

DS41106A-page 53

PIC16C712/716

9.2

Oscillator Configurations

9.2.1

OSCILLATOR TYPES

The PIC16CXXX 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

Low Power Crystal

• XT

Crystal/Resonator

• HS

High Speed Crystal/Resonator

• RC

Resistor/Capacitor

9.2.2

CRYSTAL OSCILLATOR/CERAMIC

RESONATORS

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

is connected to the OSC1/CLKIN and OSC2/CLKOUT

pins

establish

oscillation

(Figure 9-2).

The

PIC16CXXX 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

external

clock

source

drive

the

OSC1/CLKIN pin (Figure 9-3).

FIGURE 9-2:

CRYSTAL/CERAMIC

RESONATOR OPERATION

(HS, XT OR LP

OSC CONFIGURATION)

FIGURE 9-3:

EXTERNAL CLOCK INPUT

OPERATION (HS, XT OR LP

OSC CONFIGURATION)

Note 1: See Table 9-1 and Table 9-2 for recom-

mended values of C1 and C2.

2: A series resistor (RS) may be required for

AT strip cut crystals.

3: RF varies with the crystal chosen.

C1(1)

C2(1)

XTAL

OSC2

OSC1

RF(3)

SLEEP

logic

PIC16C7XX

RS(2)

internal

OSC1

OSC2

Open

Clock from

ext. system

PIC16C7XX

TABLE 9-1

CERAMIC RESONATORS

TABLE 9-2

CAPACITOR SELECTION FOR

CRYSTAL OSCILLATOR

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.

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: Recommended values of C1 and C2 are

identical to the ranges tested (Table 9-1).

2: Higher capacitance increases the stability

of the oscillator, but also increases the start-

up time.

3: Since each resonator/crystal has its own

characteristics, the user should consult the

resonator/crystal manufacturer for appropri-

ate values of external components.

4: Rs may be required in HS mode, as well as

XT mode to avoid overdriving crystals with

low drive level specification.

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