PIC12F615 datasheet(39/212 Pages) MICROCHIP

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 2010 Microchip Technology Inc.

DS41302D-page 39

PIC12F609/615/617/12HV609/615

4.3.3

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 4-3). The mode selects a low,

medium or high gain setting of the internal inverter-

amplifier to support various resonator types and speed.

LP Oscillator mode selects the lowest gain setting of

the

internal

inverter-amplifier.

mode

current

consumption is the least of the three modes. This mode

is designed to drive only 32.768 kHz tuning-fork type

crystals (watch crystals).

XT 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 resonators with a

medium drive level specification.

HS Oscillator mode selects the highest gain setting of

the

internal

inverter-amplifier.

mode

current

consumption is the highest of the three modes. This

mode is best suited for resonators that require a high

drive setting.

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

quartz crystal and ceramic resonators, respectively.

FIGURE 4-3:

QUARTZ CRYSTAL

OPERATION (LP, XT OR

HS MODE)

FIGURE 4-4:

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

to type, package and manufacturer. The

user should consult the manufacturer data

sheets for specifications and recommended

application.

2: Always verify oscillator performance over

the VDD and temperature range that is

expected for the application.

3: For oscillator design assistance, reference

the following Microchip Applications 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.

2: The value of RF varies with the Oscillator mode

selected (typically between 2 M

 to 10 M.

3: 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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