PIC16F1933-ESLASHP datasheet(109/418 Pages) MICROCHIP

109 / 418 page

Preliminary

DS41364A-page 107

PIC16F193X/LF193X

8.0

OSCILLATOR MODULE (WITH

FAIL-SAFE CLOCK MONITOR)

8.1

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 perfor-

mance and minimizing power consumption. Figure 8-1

illustrates a block diagram of the oscillator module.

Clock sources can be configured from external

oscillators, quartz crystal resonators, ceramic resonators

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

system clock source can be configured from one of three

internal oscillators, with a choice of speeds selectable via

software. Additional clock features include:

• Selectable system clock source between external

or internal 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, EC or RC modes) and switch

automatically to the internal oscillator.

The oscillator module can be configured in one of six

clock modes.

EC – External clock.

LP – 32 kHz Low-Power Crystal mode.

XT – Medium Gain Crystal or Ceramic Resonator

Oscillator mode.

HS – High Gain Crystal or Ceramic Resonator

mode.

RC – External Resistor-Capacitor (RC).

INTOSC – Internal oscillator.

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

bits in the Configuration Word Register 1 (CONFIG1).

The internal clock can be generated from two internal

oscillators.

The

HFINTOSC

calibrated

high-frequency

oscillator.

The

MFINTOSC

calibrated

medium-frequency

oscillator.

The

LFINTOSC is an uncalibrated low-frequency oscillator.

FIGURE 8-1:

SIMPLIFIED PIC® MCU CLOCK SOURCE BLOCK DIAGRAM

4 x PLL

FOSC<2:0>

Oscillator

T1OSCEN

Enable

Oscillator

T1OSO

T1OSI

Clock Source Option

for other modules

OSC1

OSC2

Sleep

LP, XT, HS, RC, EC

T1OSC

CPU and

16 MHz

8 MHz

4 MHz

2 MHz

1 MHz

250 kHz

500 kHz

IRCF<3:0>

31 kHz

Source

Internal

Oscillator

Block

WDT, PWRT, Fail-Safe Clock Monitor

16 MHz

Internal Oscillator

(HFINTOSC)

Clock

Control

SCS<1:0>

Source

16 MHz

31 kHz (LFINTOSC)

Two-Speed Start-up and other modules

Oscillator

500 kHz

Source

500 kHz

(MFINTOSC)

125 kHz

31.25 kHz

62.5 kHz

FOSC<2:0> = 100

Peripherals

Sleep

External

Timer1

PIC16F1933-E/P Datasheet(PDF) 109 Page - Microchip Technology

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