PIC16F1507-ESLASHSS. datasheet(42/278 Pages) MICROCHIP

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PIC16(L)F1507

DS40001586D-page 42

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5.0

OSCILLATOR MODULE

5.1

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 5-1

illustrates a block diagram of the oscillator module.

Clock sources can be supplied from an external clock or

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.

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 20 MHz)

INTOSC – Internal oscillator (31 kHz to 16 MHz)

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

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 INTOSC internal oscillator block produces a low and

high-frequency clock source, designated LFINTOSC and

HFINTOSC. (See Internal Oscillator Block, Figure 5-1). A

wide selection of device clock frequencies may be derived

from these two clock sources.

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