PIC16C925T-SSLASHCL datasheet(101/182 Pages) MICROCHIP

101 / 182 page

 2001 Microchip Technology Inc.

Preliminary

DS39544A-page 99

PIC16C925/926

12.2

Oscillator Configurations

12.2.1

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

12.2.2

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 12-1).

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 12-2).

FIGURE 12-1:

CRYSTAL/CERAMIC

RESONATOR OPERATION

(HS, XT OR LP

OSC CONFIGURATION)

FIGURE 12-2:

EXTERNAL CLOCK INPUT

OPERATION (HS, XT OR

LP OSC

CONFIGURATION)

TABLE 12-1:

CERAMIC RESONATORS

TABLE 12-2:

CAPACITOR SELECTION FOR

CRYSTAL OSCILLATOR

XTAL

OSC2

(Note 1)

OSC1

SLEEP

To Internal

Logic

PIC16CXXX

See Table 12-1 and Table 12-2 for recommended values

of C1 and C2.

Note 1:

A series resistor may be required for AT strip

cut crystals.

OSC1

OSC2

Open

Clock from

Ext. System

PIC16CXXX

Ranges Tested:

Mode

Freq.

455 kHz

2.0 MHz

4.0 MHz

68 - 100 pF

15 - 68 pF

68 - 100 pF

15 - 68 pF

8.0 MHz

10 - 68 pF

These values are for design guidance only.

See notes following Table 12-2.

Osc Type

Crystal

Freq.

Cap. Range

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

These values are for design guidance only.

See notes following this table.

Note 1: Recommended ranges of C1 and C2 are

depicted in Table 12-1.

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

appropriate values of external compo-

nents.

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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