PIC18F258-ESLASHSPQTP datasheet(19/402 Pages) MICROCHIP

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DS41159E-page 17

PIC18FXX8

2.0

OSCILLATOR

CONFIGURATIONS

2.1

Oscillator Types

The PIC18FXX8 can be operated in one of eight oscil-

lator modes, programmable by three configuration bits

(FOSC2, FOSC1 and FOSC0).

Low-Power Crystal

Crystal/Resonator

High-Speed Crystal/Resonator

HS4

High-Speed Crystal/Resonator with

PLL enabled

External Resistor/Capacitor

RCIO

External Resistor/Capacitor with I/O

pin enabled

External Clock

ECIO

External Clock with I/O pin enabled

2.2

Crystal Oscillator/Ceramic

Resonators

In XT, LP, HS or HS4 (PLL) Oscillator modes, a crystal

or ceramic resonator is connected to the OSC1 and

OSC2 pins to establish oscillation. Figure 2-1 shows

the pin connections. An external clock source may also

be connected to the OSC1 pin, as shown in Figure 2-3

and Figure 2-4.

The PIC18FXX8 oscillator design requires the use of a

parallel cut crystal.

FIGURE 2-1:

CRYSTAL/CERAMIC

RESONATOR OPERATION

(HS, XT OR LP OSC

CONFIGURATION)

TABLE 2-1:

CERAMIC RESONATORS

Note:

Use of a series cut crystal may give a fre-

quency out of the crystal manufacturer’s

specifications.

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 following Table 2-2.

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.

Note 1: See Table 2-1 and Table 2-2 for recommended

values of C1 and C2.

2: A series resistor (RS) may be required for AT

strip cut crystals.

3: RF varies with the crystal chosen.

C1(1)

C2(1)

XTAL

OSC2

OSC1

(3)

Sleep

Logic

PIC18FXX8

RS(2)

Internal

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