PIC16F15213 datasheet(74/408 Pages) MICROCHIP

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Figure 11-1. Clock Source Block Diagram

Filename:

152xx Clock Block Diagram.vsdx

Title:

Last Edit:

1/23/2020

First Used:

Notes:

Rev. 152x x Cloc

1/23/2020

FRQ[2:0]

HFINTOSC

External

Oscillator

(EXTOSC)

CLKIN

ECIN

31kHz

Oscillator

COSC[1:0]

LFINTOSC

– 32 MHz

Oscillator

Sleep

SYSCMD

System Clock

Peripheral

Clock

To Peripherals

2x PLL Mode

MFINTOSC

To Peripherals

31.25 kHz

500 kHz

11.2

Clock Source Types

Clock sources can be classified as external or internal.

External clock sources rely on external circuitry for the clock source to function. Examples of external clock sources

include:

• Digital oscillator modules

Internal clock sources are contained within the oscillator module. The internal oscillator block features two internal

oscillators that are used to generate internal system clock sources. The High-Frequency Internal Oscillator

(HFINTOSC) can produce a wide range of frequencies which are determined via the HFINTOSC Frequency Selection

(OSCFRQ) register. The Low-Frequency Internal Oscillator (LFINTOSC) generates a fixed nominal 31 kHz clock

signal. The internal oscillator block also features an RC oscillator (ADCRC) which is dedicated to the Analog-to-

Digital Converter (ADC).

The instruction clock (FOSC/4) can be routed to the CLKOUT pin when the pin is not in use. The Clock Out Enable

(CLKOUTEN) Configuration bit controls the functionality of the CLKOUT signal. When CLKOUTEN is clear

(CLKOUTEN = 0), the CLKOUT signal is routed to the CLKOUT pin. When CLKOUTEN is set (CLKOUTEN = 1), the

CLKOUT pin functions as an I/O pin.

11.2.1

External Clock Sources

An external clock source can be used as the device system clock by performing the following actions:

• Program the RSTOSC Configuration bits to select an external clock source that will be used as the default

system clock upon a device Reset.

• Program the FEXTOSC Configuration bits to select either the ECH (16 MHz and higher) or ECL (below 16 MHz)

mode based on the frequency of the external clock.

11.2.1.1 EC Mode

The External Clock (EC) mode allows an externally generated logic level signal to be the system clock source. When

operating in EC mode, an external clock source is connected to the CLKIN input pin. The CLKOUT pin is available as

a general purpose I/O pin or as the CLKOUT signal pin.

PIC16F15225/45

OSC - Oscillator Module

Preliminary Datasheet

DS20006389B-page 74

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