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2002 Microchip Technology Inc.

Preliminary

DS30453D-page 15

PIC16C5X

4.0

OSCILLATOR

CONFIGURATIONS

4.1

Oscillator Types

PIC16C5Xs can be operated in four different oscillator

modes. The user can program two configuration bits

(FOSC1:FOSC0) to select one of these four modes:

LP:

Low Power Crystal

XT:

Crystal/Resonator

HS:

High Speed Crystal/Resonator

RC:

Resistor/Capacitor

4.2

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 4-1).

The

PIC16C5X oscillator design requires the use of a paral-

lel cut crystal. Use of a series cut crystal may give a fre-

quency out of the crystal manufacturers specifications.

When in XT, LP or HS modes, the device can have an

external clock source drive the OSC1/CLKIN pin

(Figure 4-2).

FIGURE 4-1:

CRYSTAL/CERAMIC

RESONATOR OPERATION

(HS, XT OR LP OSC

CONFIGURATION)

FIGURE 4-2:

EXTERNAL CLOCK INPUT

OPERATION (HS, XT OR

LP OSC

CONFIGURATION)

TABLE 4-1:

CAPACITOR SELECTION FOR

CERAMIC RESONATORS -

PIC16C5X, PIC16CR5X

TABLE 4-2:

CAPACITOR SELECTION FOR

CRYSTAL OSCILLATOR -

PIC16C5X, PIC16CR5X

Note:

Not all oscillator selections available for all

parts. See Section 9.1.

Note 1: See Capacitor Selection tables for

recommended values of C1 and C2.

2: A series resistor (RS) may be required

for AT strip cut crystals.

3: RF varies with the Oscillator mode cho-

sen (approx. value = 10 M

C1(1)

C2(1)

XTAL

OSC2

OSC1

RF(3)

SLEEP

To internal

logic

RS(2)

PIC16C5X

Osc

Type

Resonator

Freq

Cap. Range

455 kHz

2.0 MHz

4.0 MHz

68-100 pF

15-33 pF

10-22 pF

68-100 pF

15-33 pF

10-22 pF

8.0 MHz

16.0 MHz

10-22 pF

10 pF

10-22 pF

10 pF

These values are for design guidance only. Since

each resonator has its own characteristics, the user

should consult the resonator manufacturer for

appropriate values of external components.

Osc

Type

Crystal

Freq

Cap.Range

Cap. Range

32 kHz(1)

15 pF

100 kHz

200 kHz

455 kHz

1 MHz

2 MHz

4 MHz

15-30 pF

15 pF

200-300 pF

100-200 pF

15-100 pF

15-30 pF

15 pF

4 MHz

8 MHz

20 MHz

15 pF

Note 1: For VDD > 4.5V, C1 = C2

≈ 30 pF is

recommended.

These values are for design guidance only. Rs may

be required in HS mode as well as XT mode to avoid

overdriving crystals with low drive level specification.

Since each crystal has its own characteristics, the

user should consult the crystal manufacturer for

appropriate values of external components.

Note:

If you change from this device to another

device, please verify oscillator characteris-

tics in your application.

Clock from

ext. system

OSC1

OSC2

PIC16C5X

Open

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