PIC16F1503 datasheet(45/340 Pages) MICROCHIP

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 2011 Microchip Technology Inc.

Preliminary

DS41607A-page 45

PIC16(L)F1503

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.

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 EC clock mode relies on an external logic level

signal as the device clock source.

The INTOSC internal oscillator block produces low and

high frequency clock sources, designated LFINTOSC

and HFINTOSC. (see Internal Oscillator Block,

Figure 5-1). A wide selection of device clock

frequencies may be derived from these clock sources.

FIGURE 5-1:

SIMPLIFIED PIC® MCU CLOCK SOURCE BLOCK DIAGRAM

FOSC<1:0>

CPU and

16 MHz

8 MHz

4 MHz

2 MHz

1 MHz

250 kHz

500 kHz

IRCF<3:0>

31 kHz

16 MHz

Source

Internal

Oscillator

Block

WDT, PWRT and other modules

16 MHz

Internal Oscillator

(HFINTOSC)

Clock

Control

SCS<1:0>

31 kHz (LFINTOSC)

31 kHz

Source

125 kHz

31.25 kHz

62.5 kHz

Peripherals

Sleep

CLKIN

CLKIN EC

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