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Sheet目录3862

118页 119页 120页 121页 [122页]123页 124页 125页 126页

1997 Microchip Technology Inc.

DS30272A-page 49

PIC16C71X

8.2

Oscillator Congurations

8.2.1

OSCILLATOR TYPES

The PIC16CXX can be operated in four different oscil-

lator modes. The user can program two conguration

bits (FOSC1 and FOSC0) to select one of these four

modes:

Low Power Crystal

Crystal/Resonator

High Speed Crystal/Resonator

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

establish

oscillation

(Figure 8-4).

The

PIC16CXX 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 specica-

tions. 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 8-4:

CRYSTAL/CERAMIC

RESONATOR OPERATION

(HS, XT OR LP

OSC CONFIGURATION)

FIGURE 8-5:

EXTERNAL CLOCK INPUT

OPERATION (HS, XT OR LP

OSC CONFIGURATION)

XTAL

OSC2

Note1

OSC1

SLEEP

PIC16CXXX

See Table 8-1 and Table 8-1 for recommended values of

C1 and C2.

Note 1:

A series resistor may be required for AT strip

cut crystals.

The buffer is on the OSC2 pin.

(2)

To internal

logic

OSC1

OSC2

Open

Clock from

ext. system

PIC16CXXX

TABLE 8-1:

CERAMIC RESONATORS,

PIC16C71

TABLE 8-2:

CAPACITOR SELECTION

FOR CRYSTAL OSCILLATOR,

PIC16C71

Ranges Tested:

Mode

Freq

OSC1

OSC2

455 kHz

2.0 MHz

4.0 MHz

47 - 100 pF

15 - 68 pF

47 - 100 pF

15 - 68 pF

8.0 MHz

16.0 MHz

15 - 68 pF

10 - 47 pF

15 - 68 pF

10 - 47 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%

All resonators used did not have built-in capacitors.

Mode

Freq

OSC1

OSC2

32 kHz

200 kHz

33 - 68 pF

15 - 47 pF

33 - 68 pF

15 - 47 pF

100 kHz

500 kHz

1 MHz

2 MHz

4 MHz

47 - 100 pF

20 - 68 pF

15 - 68 pF

15 - 47 pF

15 - 33 pF

47 - 100 pF

20 - 68 pF

15 - 68 pF

15 - 47 pF

15 - 33 pF

8 MHz

20 MHz

15 - 47 pF

These values are for design guidance only. See

notes at bottom of page.

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