PIC16F18344-ISLASHSS datasheet(79/489 Pages) MICROCHIP

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 2015-2017 Microchip Technology Inc.

DS40001800C-page 79

PIC16(L)F18324/18344

7.2.1.2

LP, XT, HS Modes

The LP, XT and HS modes support the use of quartz

crystal resonators or ceramic resonators connected to

OSC1 and OSC2 (Figure 7-3). The three modes select

a low, medium or high gain setting of the internal

inverter-amplifier to support various resonator types

and speed.

Oscillator mode selects the lowest gain setting of the

internal inverter-amplifier. LP mode current consumption

is the least of the three modes. This mode is designed to

drive 32.768 kHz tuning-fork type crystals (watch

crystals), but can operate up to 100 kHz.

Oscillator mode selects the intermediate gain

setting of the internal inverter-amplifier. XT mode

current consumption is the medium of the three modes.

This mode is best suited to drive crystals and

resonators with a frequency range up to 4 MHz.

Oscillator mode selects the highest gain setting of the

internal inverter-amplifier. HS mode current consumption

is the highest of the three modes. This mode is best

suited for resonators that require operating frequencies

up to 20 MHz.

Figure 7-3 and Figure 7-4 show typical circuits for

quartz crystal and ceramic resonators, respectively.

FIGURE 7-3:

QUARTZ CRYSTAL

OPERATION (LP, XT OR

HS MODE)

FIGURE 7-4:

CERAMIC RESONATOR

OPERATION

(XT OR HS MODE)

Note 1:

A series resistor (RS) may be required for

quartz crystals with low drive level.

The value of RF varies with the Oscillator mode

selected (typically between 2 M

 to 10 M.

Quartz

RS(1)

OSC1/CLKIN

RF(2)

Sleep

To Internal

Logic

PIC® MCU

Crystal

OSC2/CLKOUT

Note 1:

Quartz

crystal

characteristics

vary

according

type,

package

and

manufacturer. The user should consult the

manufacturer data sheets for specifications

and recommended application.

Always verify oscillator performance over

the VDD and temperature range that is

expected for the application.

For oscillator design assistance, reference

the following Microchip Application Notes:

• AN826, “Crystal Oscillator Basics and

Crystal Selection for rfPIC® and PIC®

Devices

” (DS00826)

• AN849, “Basic PIC® Oscillator Design”

(DS00849)

• AN943, “Practical PIC® Oscillator

Analysis and Design

” (DS00943)

• AN949, “Making Your Oscillator Work”

(DS00949)

Note 1:

A series resistor (RS) may be required for

ceramic resonators with low drive level.

The value of RF varies with the Oscillator mode

selected (typically between 2 M

 to 10 M.

An additional parallel feedback resistor (RP)

may be required for proper ceramic resonator

operation.

C2 Ceramic

RS(1)

OSC1/CLKIN

RF(2)

Sleep

To Internal

Logic

PIC® MCU

RP(3)

Resonator

OSC2/CLKOUT

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