PIC16F18345 datasheet(64/442 Pages) MICROCHIP

64 / 442 page

PIC16(L)F18313/18323

DS40001799A-page 64

Preliminary

 2015 Microchip Technology Inc.

6.0

OSCILLATOR MODULE (WITH

FAIL-SAFE CLOCK MONITOR)

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

performance and minimizing power consumption.

Figure 6-1 illustrates a block diagram of the oscillator

module.

Clock sources can be supplied from external oscillators,

quartz-crystal resonators and ceramic resonators. In

addition, the system clock source can be supplied from

one of two internal oscillators and PLL circuits, with a

choice of speeds selectable via software. Additional

clock features include:

• Selectable system clock source between external

or internal sources via software.

• Fail-Safe Clock Monitor (FSCM) designed to

detect a failure of the external clock source (LP,

XT, HS, ECH, ECM, ECL) and switch

automatically to the internal oscillator.

• Oscillator Start-up Timer (OST) ensures stability

of crystal oscillator sources.

The RSTOSC bits of Configuration Word 1 determine

the type of oscillator that will be used when the device

is reset, including when it is first powered up.

The internal clock modes, LFINTOSC, HFINTOSC (set

at 1 MHz), or HFINTOSC (set at 32 MHz) can be set

through the RSTOSC bits.

If an external clock source is selected, the FEXTOSC

bits of Configuration Word 1 must be used in

conjunction with the RSTOSC bits to select the

External Clock mode.

The external oscillator module can be configured in one

of the following clock modes, by setting the

FEXTOSC<2:0> bits of Configuration Word 1:

ECL – External Clock Low-Power mode

(below 100 MHz)

ECM – External Clock Medium-Power mode

(100 kHz to 8 MHz)

ECH – External Clock High-Power mode

(above 8 MHz)

LP – 32 kHz Low-Power Crystal mode.

XT – Medium Gain Crystal or Ceramic Resonator

Oscillator mode (between 100 MHz and 4 MHz)

HS – High Gain Crystal or Ceramic Resonator

mode (above 4 MHz)

The ECH, ECM, and ECL clock modes rely on an

external logic level signal as the device clock source.

The LP, XT, and HS clock modes require an external

crystal or resonator to be connected to the device.

Each mode is optimized for a different frequency range.

The INTOSC internal oscillator block produces low and

high-frequency clock sources, designated LFINTOSC

and HFINTOSC. (see Internal Oscillator Block,

Figure 6-1).

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