PIC16F15213 datasheet(78/439 Pages) MICROCHIP

78 / 439 page

Figure 11-1. Clock Source Block Diagram

Filename:

152xx Clock Block Diagram.vsdx

Title:

Last Edit:

4/29/2021

First Used:

Notes:

FRQ[2:0]

HFINTOSC

External

Oscillator

(EXTOSC)

CLKIN

31kHz

Oscillator

COSC[1:0]

LFINTOSC

– 32 MHz

Oscillator

Sleep

SYSCMD

System Clock

Peripheral

Clock

2x PLL Mode

MFINTOSC

31.25 kHz

500 kHz

SFINTOSC

1 MHz

HFINTOSC (1-32 MHz)

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, such as 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).

Important: The PIC16F152 microcontroller family does not allow the system clock source to be changed

through clock switching. Once the RSTOSC Configuration bits select the oscillator source, the source

cannot be changed via software. If the HFINTOSC is selected as the clock source, the HFINTOSC

frequency may be changed by modifying the FRQ bits.

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 the external clock source (RSTOSC = 111)

PIC16F15213/14/23/24/43/44

OSC - Oscillator Module

and its subsidiaries

Data Sheet

DS40002195E-page 78

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