PIC18F45J11-I/ML【PDF 162/228 页】IC PIC MCU FLASH 32K 2V 44-QFN

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Sheet目录3862

158页 159页 160页 161页 [162页]163页 164页 165页 166页

2011 Microchip Technology Inc.

DS39932D-page 39

PIC18F46J11 FAMILY

3.2.2

CRYSTAL OSCILLATOR/CERAMIC

RESONATORS

In HS and HSPLL Oscillator modes, a crystal or

ceramic resonator is connected to the OSC1 and

OSC2 pins to establish oscillation. Figure 3-2 displays

the pin connections.

The oscillator design requires the use of a parallel

resonant crystal.

FIGURE 3-2:

CRYSTAL/CERAMIC

RESONATOR OPERATION

(HS OR HSPLL

CONFIGURATION)

TABLE 3-2:

CAPACITOR SELECTION FOR

CERAMIC RESONATORS

TABLE 3-3:

CAPACITOR SELECTION FOR

CRYSTAL OSCILLATOR

Note:

Use of a series resonant crystal may give

a frequency out of the crystal manufac-

turer’s specifications.

Typical Capacitor Values Used:

Mode

Freq

OSC1

OSC2

8.0 MHz

16.0 MHz

27 pF

22 pF

27 pF

22 pF

Capacitor values are for design guidance only.

These capacitors were tested with the resonators

listed below for basic start-up and operation. These

values are not optimized

Different capacitor values may be required to produce

acceptable oscillator operation. The user should test

the performance of the oscillator over the expected

VDD and temperature range for the application.

See the notes following Table 3-3 for additional

information.

Resonators Used:

4.0 MHz

8.0 MHz

16.0 MHz

Note

See Table 3-2 and Table 3-3 for initial values

of C1 and C2.

Rs may be required to avoid overdriving

crystals with low drive level specification.

C1(1)

C2(1)

XTAL

OSC2

OSC1

Sleep

Logic

RS(2)

Internal

PIC18F46J11

Osc Type

Crystal

Freq

Typical Capacitor Values

Tested:

4 MHz

27 pF

8 MHz

22 pF

20 MHz

15 pF

Capacitor values are for design guidance only.

These capacitors were tested with the crystals listed

below for basic start-up and operation. These values

are not optimized.

Different capacitor values may be required to produce

acceptable oscillator operation. The user should test

the performance of the oscillator over the expected

VDD and temperature range for the application.

See the notes following this table for additional

information.

Crystals Used:

4 MHz

8 MHz

20 MHz

Note 1:

Higher capacitance not only increases

the stability of oscillator, but also

increases the start-up time.

Since each resonator/crystal has its own

characteristics, the user should consult

the resonator/crystal manufacturer for

appropriate

values

external

components.

Rs may be required to avoid overdriving

crystals with low drive level specification.

Always verify oscillator performance over

the VDD and temperature range that is

expected for the application.

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