PIC16F526-ISLASHP datasheet(45/122 Pages) MICROCHIP

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 2010 Microchip Technology Inc.

DS41326D-page 45

PIC16F526

8.2

Oscillator Configurations

8.2.1

OSCILLATOR TYPES

The PIC16F526 device can be operated in up to six

different oscillator modes. The user can program up to

three Configuration bits (FOSC<2:0>). To select one of

these modes:

• LP:

Low-Power Crystal

• XT:

Crystal/Resonator

• HS:

High-Speed Crystal/Resonator

• INTRC: Internal 4/8 MHz Oscillator

• EXTRC: External Resistor/Capacitor

• EC:

External High-Speed Clock Input

8.2.2

CRYSTAL OSCILLATOR/CERAMIC

RESONATORS

In HS, XT or LP modes, a crystal or ceramic resonator

is connected to the RB5/OSC1/CLKIN and RB4/OSC2/

CLKOUT pins to establish oscillation (Figure 8-1). The

PIC16F526 oscillator designs require the use of a

parallel cut crystal. Use of a series cut crystal may give

a frequency out of the crystal manufacturers

specifications. When in HS, XT or LP modes, the

device can have an external clock source drive the

RB5/OSC1/CLKIN pin (Figure 8-2). In this mode, the

output drive levels on the OSC2 pin are very weak. If

the part is used in this fashion, then this pin should be

left open and unloaded. Also when using this mode, the

external clock should observe the frequency limits for

the Clock mode chosen (HS, XT or LP).

FIGURE 8-1:

CRYSTAL OPERATION

(OR CERAMIC

RESONATOR)

(HS, XT OR LP OSC

CONFIGURATION)

FIGURE 8-2:

EXTERNAL CLOCK INPUT

OPERATION (HS, XT, LP

OR EC OSC

CONFIGURATION)

TABLE 8-1:

CAPACITOR SELECTION FOR

CERAMIC RESONATORS

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 to process differences in 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

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.

Note 1:

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

.

C1(1)

C2(1)

XTAL

OSC2

OSC1

RF(3)

Sleep

To internal

logic

RS(2)

PIC16F526

Clock From

ext. system

PIC16F526

OSC2/CLKOUT/RB4

RB5/OSC1/CLKIN

OSC2/CLKOUT/RB4(1)

EC, HS, XT, LP

Note 1: RB4 is available in EC mode only.

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