PIC16F18345 datasheet(68/442 Pages) MICROCHIP

68 / 442 page

PIC16(L)F18313/18323

DS40001799A-page 68

Preliminary

 2015 Microchip Technology Inc.

6.2.1.4

4x PLL

The oscillator module contains a PLL that can be used

with external clock sources to provide a system clock

source. The input frequency for the PLL must fall within

specifications.

See

the

PLL

Clock

Timing

Specifications in Table 34-9.

The PLL may be enabled for use by one of two

methods:

Program the RSTOSC bits in the Configuration

Word 1 to enable the EXTOSC with 4x PLL.

Write the NOSC bits in the OSCCON1 register

to enable the EXTOSC with 4x PLL.

6.2.1.5

Secondary Oscillator

The secondary oscillator is a separate oscillator block

that can be used as an alternate system clock source.

The secondary oscillator is optimized for 32.768 kHz,

and can be used with an external crystal oscillator con-

nected to the SOSCI and SOSCO device pins, or an

external clock source connected to the SOSCIN pin.

The secondary oscillator can be selected during

run-time using clock switching. Refer to Section 6.3

“Clock Switching”

for more information.

FIGURE 6-5:

QUARTZ CRYSTAL

OPERATION

(SECONDARY

OSCILLATOR)

32.768 kHz

SOSCI

To Internal

Logic

PIC® MCU

Crystal

SOSCO

Quartz

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)

• TB097, Interfacing a Micro Crystal

MS1V-T1K 32.768 kHz Tuning Fork

Crystal to a PIC16F690/SS

(DS91097)

• AN1288, Design Practices for

Low-Power External Oscillators

(DS01288)

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