PIC16C83 datasheet(39/117 Pages) MICROCHIP

39 / 117 page

DS30081F-page 39

PIC16C8X

8.2

Oscillator Conﬁgurations

8.2.1

OSCILLATOR TYPES

The PIC16C8X can be operated in four different

oscillator

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

8.2.2

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 to establish oscillation (Figure 8-4).

FIGURE 8-4:

CRYSTAL/CERAMIC

RESONATOR OPERATION

(HS, XT OR LP OSC

CONFIGURATION)

The PIC16C8X oscillator design requires the use of a

parallel cut crystal. Use of a series cut crystal may give

frequency

out

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 8-5).

FIGURE 8-5:

EXTERNAL CLOCK INPUT

OPERATION (HS, XT OR LP

OSC CONFIGURATION)

See Table 8-1 and Table 8-3 for recommended

values of C1 and C2.

Note 1: A series resistor may be required for AT

strip cut crystals.

XTAL

OSC2

Note1

OSC1

SLEEP

To internal

logic

PIC16CXX

OSC1

OSC2

Open

Clock from

ext. system

PIC16CXX

TABLE 8-1:

PIC16C84 CAPACITOR

SELECTION FOR CERAMIC

RESONATORS

TABLE 8-2:

PIC16C83/R83/84A/R84

CAPACITOR SELECTION

FOR CERAMIC

RESONATORS

Ranges Tested:

Mode

Freq

OSC1/C1

OSC2/C2

455 kHz

2.0 MHz

4.0 MHz

47 - 100 pF

15 - 33 pF

47 - 100 pF

15 - 33 pF

8.0 MHz

10.0 MHz

15 - 33 pF

Note :

Recommended values of C1 and C2 are identical

to the ranges tested table.

Higher capacitance increases the stability of the

oscillator but also increases the start-up time.

These values are for design guidance only. Since

each resonator has its own characteristics, the user

should consult the resonator manufacturer for the

appropriate values of external components.

Resonators Tested:

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%

10.0 MHz

Murata Erie CSA10.00MTZ

± 0.5%

None of the resonators had built-in capacitors.

Ranges Tested:

Mode

Freq

OSC1/C1

OSC2/C2

455 kHz

2.0 MHz

4.0 MHz

47 - 100 pF

15 - 33 pF

47 - 100 pF

15 - 33 pF

8.0 MHz

10.0 MHz

15 - 33 pF

Note :

Recommended values of C1 and C2 are identical

to the ranges tested table.

Higher capacitance increases the stability of the

oscillator but also increases the start-up time.

These values are for design guidance only. Since

each resonator has its own characteristics, the user

should consult the resonator manufacturer for the

appropriate values of external components.

Resonators Tested:

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%

10.0 MHz

Murata Erie CSA10.00MTZ

± 0.5%

None of the resonators had built-in capacitors.

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