PIC16LF1713 datasheet(68/483 Pages) MICROCHIP

68 / 483 page

PIC16(L)F1717/8/9

DS40001740B-page 68

 2014-2015 Microchip Technology Inc.

6.0

OSCILLATOR MODULE (WITH

FAIL-SAFE CLOCK MONITOR)

6.1

Overview

The oscillator module has a wide variety of clock

sources and selection features that allow it to be used

in a wide range of applications while maximizing

performance and minimizing power consumption.

Figure 6-1 illustrates a block diagram of the oscillator

module.

Clock sources can be supplied from external oscillators,

quartz crystal resonators, ceramic resonators and

Resistor-Capacitor (RC) circuits. In addition, the system

clock source can be supplied from one of two internal

oscillators and PLL circuits, with a choice of speeds

selectable via software. Additional clock features

include:

• Selectable system clock source between external

or internal sources via software

• Two-Speed Start-up mode, which minimizes

latency between external oscillator start-up and

code execution

• Fail-Safe Clock Monitor (FSCM) designed to

detect a failure of the external clock source (LP,

XT, HS, ECH, ECM, ECL or EXTRC modes) and

switch automatically to the internal oscillator

• Oscillator Start-up Timer (OST), which ensures

stability of crystal oscillator sources

The oscillator module can be configured in one of the

following clock modes:

ECL – External Clock Low-Power mode

(0 MHz to 0.5 MHz)

ECM – External Clock Medium Power mode

(0.5 MHz to 4 MHz)

ECH – External Clock High-Power mode

(4 MHz to 32 MHz)

LP – 32 kHz Low-Power Crystal mode.

XT – Medium Gain Crystal or Ceramic Resonator

Oscillator mode (up to 4 MHz)

HS – High Gain Crystal or Ceramic Resonator

mode (4 MHz to 20 MHz)

EXTRC – External Resistor-Capacitor

INTOSC – Internal oscillator (31 kHz to 32 MHz)

Clock Source modes are selected by the FOSC<2:0>

bits in the Configuration Words. The FOSC bits

determine the type of oscillator that will be used when

the device is first powered.

The ECH, ECM, and ECL clock modes rely on an

external logic level signal as the device clock source.

The LP, XT, and HS clock modes require an external

crystal or resonator to be connected to the device.

Each mode is optimized for a different frequency range.

The EXTRC clock mode requires an external resistor

and capacitor to set the oscillator frequency.

The INTOSC internal oscillator block produces low,

medium,

and

high-frequency

clock

sources,

designated LFINTOSC, MFINTOSC and HFINTOSC.

(see Internal Oscillator Block, Figure 6-1). A wide

selection of device clock frequencies may be derived

from these three clock sources.

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