PIC16F871 Datasheet

IC型号：
PIC16F871
PDF描述：
28/40-Pin, 8-Bit CMOS FLASH Microcontrollers
文件大小：
1755.40KB
PDF页数：
172页
芯片厂家：
Microchip

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PIC16F870/871

11.2

11.2.1

Oscillator Configurations

OSCILLATOR TYPES

TABLE 11-1:

CERAMIC RESONATORS

Ranges Tested:

The PIC16F870/871 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:

鈥?/div>

Low Power Crystal

Crystal/Resonator

High Speed Crystal/Resonator

Resistor/Capacitor

CRYSTAL OSCILLATOR/CERAMIC

RESONATORS

Mode

Freq

455 kHz

2.0 MHz

4.0 MHz

8.0 MHz

16.0 MHz

OSC1

68 - 100 pF

15 - 68 pF

10 - 68 pF

10 - 22 pF

OSC2

68 - 100 pF

15 - 68 pF

10 - 68 pF

10 - 22 pF

These values are for design guidance only.

See

notes at bottom of page.

11.2.2

Resonators Used:

455 kHz

2.0 MHz

4.0 MHz

8.0 MHz

16.0 MHz

Panasonic EFO-A455K04B

Murata Erie CSA2.00MG

Murata Erie CSA4.00MG

Murata Erie CSA8.00MT

Murata Erie CSA16.00MX

卤

0.3%

卤

0.5%

卤

0.5%

卤

0.5%

卤

0.5%

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 11-1). The

PIC16F870/871 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 specifica-

tions. When in XT, LP or HS modes, the device can

have an external clock source to drive the OSC1/

CLKIN pin (Figure 11-2).

All resonators used did not have built-in capacitors.

FIGURE 11-1: CRYSTAL/CERAMIC

RESONATOR OPERATION

(HS, XT OR LP

OSC CONFIGURATION)

(1)

OSC1

internal

logic

SLEEP

PIC16F870/871

XTAL

OSC2

(2)

(1)

(3)

Note 1:

See Table 11-1 and Table 11-2 for rec-

ommended values of C1 and C2.

A series resistor (RS) may be required

for AT strip cut crystals.

RF varies with the crystal chosen.

FIGURE 11-2: EXTERNAL CLOCK INPUT

OPERATION (HS, XT OR LP

OSC CONFIGURATION)

Clock from

ext. system

Open

OSC1

PIC16F870/871

OSC2

漏

1999 Microchip Technology Inc.

Preliminary

DS30569A-page 91

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