PIC16LC62BT datasheet(56/122 Pages) MICROCHIP

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PIC16C62B/72A

DS35008C-page 56

Preliminary

 1998-2013 Microchip Technology Inc.

10.2

Oscillator Configurations

10.2.1

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

10.2.2

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 10-2).

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 use

an external clock source to drive the OSC1/CLKIN pin

(Figure 10-3).

FIGURE 10-2: CRYSTAL/CERAMIC

RESONATOR OPERATION

(HS, XT OR LP

OSC CONFIGURATION)

FIGURE 10-3: EXTERNAL CLOCK INPUT

OPERATION (HS, XT OR LP

OSC CONFIGURATION)

TABLE 10-1

CERAMIC RESONATORS

TABLE 10-2

CAPACITOR SELECTION FOR

CRYSTAL OSCILLATOR

Note1:

See Table 10-1 and Table 10-2 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 chosen.

C1(1)

C2(1)

XTAL

OSC2

OSC1

RF(3)

SLEEP

logic

PIC16CXXX

RS(2)

internal

OSC1

OSC2

Open

Clock from

ext. system

PIC16CXXX

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.

Resonators Used:

455 kHz

Panasonic EFO-A455K04B

 0.3%

2.0 MHz

Murata Erie CSA2.00MG

 0.5%

4.0 MHz

Murata Erie CSA4.00MG

 0.5%

8.0 MHz

Murata Erie CSA8.00MT

 0.5%

16.0 MHz Murata Erie CSA16.00MX

 0.5%

Resonators 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.

Crystals Used

32 kHz

Epson C-001R32.768K-A

± 20 PPM

200 kHz

STD XTL 200.000KHz

± 20 PPM

1 MHz

ECS ECS-10-13-1

± 50 PPM

4 MHz

ECS ECS-40-20-1

± 50 PPM

8 MHz

EPSON CA-301 8.000M-C

± 30 PPM

20 MHz

EPSON CA-301 20.000M-C

± 30 PPM

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 charac-

teristics, the user should consult the resona-

tor/crystal manufacturer for appropriate values of

external components.

3: Rs may be required in HS mode, as well as XT

mode, to avoid overdriving crystals with low drive

level specification.

4: Oscillator performance should be verified when

migrating between devices (including

PIC16C62A to PIC16C62B and PIC16C72 to

PIC16C72A)

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