PIC16F506T-ISLASHP datasheet(60/116 Pages) MICROCHIP

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PIC12F510/16F506

DS41268C-page 58

Preliminary

10.2

Oscillator Configurations

10.2.1

OSCILLATOR TYPES

The PIC12F510/16F506 devices can be operated in up

to six different oscillator modes. The user can program

three

Configuration

bits

(FOSC<1:0>

[PIC12F510], FOSC<2:0> [PIC16F506]). To select one

of these modes:

•LP:

Low-Power Crystal

•XT:

Crystal/Resonator

•HS:

High-Speed Crystal/Resonator

(PIC16F506 only)

•INTOSC:

Internal 4/8 MHz Oscillator

•EXTRC:

External Resistor/Capacitor

•EC:

External High-Speed Clock Input

(PIC16F506 only)

10.2.2

CRYSTAL OSCILLATOR/CERAMIC

RESONATORS

In HS (PIC16F506), XT or LP modes, a crystal or

ceramic resonator is connected to the (GP5/RB5)/

OSC1/(CLKIN) and (GP4/RB4)/OSC2/(CLKOUT) pins

to establish oscillation (Figure 10-1). The PIC12F510/

16F506 oscillator designs require the use of a parallel

cut crystal. Use of a series cut crystal may give a fre-

quency out of the crystal manufacturers specifications.

When in HS (PIC16F506), XT or LP modes, the device

can have an external clock source drive the (GP5/

RB5)/OSC1/CLKIN pin (Figure 10-2).

FIGURE 10-1:

CRYSTAL OPERATION

(OR CERAMIC

RESONATOR)

(HS, XT OR LP OSC

CONFIGURATION)

FIGURE 10-2:

EXTERNAL CLOCK INPUT

OPERATION (HS, XT OR

LP OSC

CONFIGURATION)

TABLE 10-1:

CAPACITOR SELECTION FOR

CERAMIC RESONATORS –

PIC12F510/16F506(1)

Note 1: This device has been designed to per-

form to the parameters of its data sheet.

It has been tested to an electrical

specification designed to determine its

conformance with these parameters.

Due

process

differences

the

manufacture of this device, this device

may have different performance charac-

teristics than its earlier version. These

differences may cause this device to

perform differently in your application

than the earlier version of this device.

2: The user should verify that the device

oscillator

starts

and

performs

expected. Adjusting the loading capacitor

values and/or the Oscillator mode may

be required.

Osc.

Type

Resonator

Freq.

Cap. Range

4.0 MHz

30 pF

HS(2)

16 MHz

10-47 pF

Note 1:

These values are for design guidance

only. Since each resonator has its own

characteristics, the user should consult

the resonator manufacturer for

appropriate values of external

components.

PIC16F506 only.

Note

See Capacitor Selection tables for

recommended values of C1 and C2.

A series resistor (RS) may be required for AT

strip cut crystals.

RF approx. value = 10 M

Ω.

C1(1)

C2(1)

XTAL

OSC2

OSC1

RF(3)

Sleep

To internal

logic

RS(2)

PIC12F510

PIC16F506

Clock from

ext. system

OSC1

OSC2

Open

PIC12F510

PIC16F506

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