PIC16F16-ESLASHSOSQTP datasheet(65/136 Pages) MICROCHIP

65 / 136 page

DS41206B-page 63

PIC16F716

9.2

Oscillator Configurations

9.2.1

OSCILLATOR TYPES

The PIC16F716 can be operated in four different

oscillator modes. The user can program two Configura-

tion 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 9-1).

The

PIC16F716 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

specifications. When in XT, LP or HS modes, the

device can have an external clock source to drive the

OSC1/CLKIN pin (Figure 9-2).

FIGURE 9-1:

CRYSTAL/CERAMIC

RESONATOR OPERATION

(HS, XT OR LP

OSC CONFIGURATION)

FIGURE 9-2:

EXTERNAL CLOCK INPUT

OPERATION (HS, XT OR

LP OSC

CONFIGURATION)

TABLE 9-1:

CERAMIC RESONATORS

TABLE 9-2:

CAPACITOR SELECTION FOR

CRYSTAL OSCILLATOR

Note 1:

See Table 9-1 and Table 9-2 for

recommended values of C1 and C2.

A series resistor (RS) may be required.

RF varies with the crystal chosen.

C1(1)

C2(1)

XTAL

OSC2

OSC1

RF(3)

Sleep

logic

PIC16F716

RS(2)

internal

OSC1

OSC2

Open

Clock from

ext. system

PIC16F716

Ranges Tested:

Mode

Freq

OSC1 (C1)

OSC2 (C2)

455 kHz

2.0 MHz

68-100 pF

15-68 pF

68-100 pF

15-68 pF

4.0 MHz

8.0 MHz

16.0 MHz

10-68 pF

15-68 pF

10-22 pF

10-68 pF

15-68 pF

10-22 pF

Note 1: These values are for design guidance

only. See notes at bottom of page.

Osc Type

Crystal

Freq

Cap. Range

32 kHz

15-33 pF

200 kHz

5-10 pF

200 kHz

47-68 pF

1 MHz

15-33 pF

4 MHz

15-33 pF

4 MHz

15-33 pF

8 MHz

15-33 pF

20 MHz

15-33 pF

Note 1:

These values are for design guidance only.

See notes at bottom of page.

Note 1: Higher capacitance increases the stability

of the oscillator, but also increases the

start-up time.

2: Since each resonator/crystal has its own

characteristics, the user should consult

the resonator/crystal manufacturer for

appropriate

values

external

components.

3: RS may be required to avoid overdriving

crystals with low drive level specification.

4: When using an external clock for the

OSC1 input, loading of the OSC2 pin

must be kept to a minimum by leaving the

OSC2 pin unconnected.

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