PIC16LF1902-I/P View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC16LF1902-I/P

28-Pin Flash-Based, 8-Bit CMOS Microcontrollers with LCD Driver and nanoWatt XLP Technology

Microchip Technology 

6.0 OSCILLATOR MODULE

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 perfor-

mance and minimizing power consumption. Figure 6-1

illustrates a block diagram of the oscillator module.

Clock sources can be supplied from external clock

circuits. In addition, the system clock source can be

supplied from one of two internal oscillators, with a

choice of speeds selectable via software. Additional

clock features include:

• Selectable system clock source between external

or internal sources via software.

• Fast start-up oscillator allows internal circuits to

power up and stabilize before switching to the 16

MHz HFINTOSC

The oscillator module can be configured in one of the

following clock modes:

1. ECL – External Clock Low Power mode

(0 MHz to 0.5 MHz)

2. ECM – External Clock Medium Power mode

(0.5 MHz to 4 MHz)

3. ECH – External Clock High Power mode

(4 MHz to 32 MHz)

4. INTOSC – Internal oscillator (31 kHz to 16 MHz).

Clock Source modes are selected by the FOSC<1:0>

bits in the Configuration Word 1. The FOSC bits

determine the type of oscillator that will be used when

the device is first powered.

The EC Clock mode relies on an external logic level

signal as the device clock source.

The INTOSC internal oscillator block produces a low

and high frequency clock source, designated

LFINTOSC and HFINTOSC. (see Internal Oscillator

Block, Figure 6-1). A wide selection of device clock

frequencies may be derived from these two clock

sources.

PIC16LF1902/3

 2011 Microchip Technology Inc.

Preliminary

DS41455A-page 51

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