PIC10LF322T-EMCSQTP datasheet(28/210 Pages) MICROCHIP

28 / 210 page

PIC10(L)F320/322

DS41585A-page 28

Preliminary

 2011 Microchip Technology Inc.

4.2

Clock Source Modes

Clock source modes can be classified as external or

internal.

• Internal clock source (INTOSC) is contained

within the oscillator module, which has eight

selectable output frequencies, with a maximum

internal frequency of 16 MHz.

• The External Clock mode (EC) relies on an

external signal for the clock source.

The system clock can be selected between external or

internal clock sources via the FOSC bit of the

Configuration Word.

4.3

Internal Clock Modes

The internal clock sources are contained within the

oscillator module. The internal oscillator block has two

internal oscillators that are used to generate all internal

system clock sources: the 16 MHz High-Frequency

Internal Oscillator (HFINTOSC) and the 31 kHz

(LFINTOSC).

The HFINTOSC consists of a primary and secondary

clock. The secondary clock starts first with rapid start-

up time, but low accuracy. The secondary clock ready

signal is indicated with the HFIOFR bit of the OSCCON

time and higher accuracy. The primary clock is stable

when the HFIOFS bit of the OSCCON register bit goes

high.

4.3.1

INTOSC MODE

When the FOSC bit of the Configuration Word is

cleared, the INTOSC mode is selected. When INTOSC

is selected, CLKIN pin is available for general purpose

I/O. See Section 3.0 “Device Configuration” for

more information.

4.3.2

FREQUENCY SELECT BITS (IRCF)

The output of the 16 MHz HFINTOSC is connected to

a divider and multiplexer (see Figure 4-1). The Internal

Oscillator Frequency Select bits (IRCF) of the

OSCCON register select the frequency output of the

internal oscillator:

•HFINTOSC

-16 MHz

- 8 MHz (default after Reset)

-4 MHz

-2 MHz

-1 MHz

-500 kHz

-250 kHz

•LFINTOSC

-31 kHz

There is no delay when switching between HFINTOSC

frequencies with the IRCF bits. This is because the

switch involves only a change to the frequency output

divider.

Start-up

delay

specifications

are

located

Section 24.0 “Electrical Specifications”

Note:

Following any Reset, the IRCF<2:0> bits

of the OSCCON register are set to ‘110’

and the frequency selection is set to

8 MHz. The user can modify the IRCF bits

to select a different frequency.

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