PIC16LF1713 datasheet(72/483 Pages) MICROCHIP

72 / 483 page

PIC16(L)F1717/8/9

DS40001740B-page 72

 2014-2015 Microchip Technology Inc.

6.2.1.4

4x PLL

The oscillator module contains a 4x PLL that can be

used with both external and internal clock sources to

provide a system clock source. The input frequency for

the 4x PLL must fall within specifications. See the PLL

Clock Timing Specifications in Table 34-9: PLL Clock

Timing Specifications.

The 4x PLL may be enabled for use by one of two

methods:

Program the PLLEN bit in Configuration Words

to a ‘1’.

Write the SPLLEN bit in the OSCCON register to

a ‘1’. If the PLLEN bit in Configuration Words is

programmed to a ‘1’, then the value of SPLLEN

is ignored.

6.2.1.5

Secondary Oscillator

The secondary oscillator is a separate crystal oscillator

that is associated with the Timer1 peripheral. It is

optimized for timekeeping operations with a 32.768

kHz crystal connected between the SOSCO and

SOSCI device pins.

The secondary oscillator can be used as an alternate

system clock source and 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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