PIC16F720-ESLASHSS datasheet(69/244 Pages) MICROCHIP

69 / 244 page

 2010 Microchip Technology Inc.

DS41430A-page 69

PIC16F/LF720/721

7.4

Oscillator Control

The Oscillator Control (OSCCON) register (Figure 7-1)

displays the status and allows frequency selection of the

internal

oscillator

(INTOSC)

system

clock.

The

OSCCON register contains the following bits:

• Frequency selection bits (IRCF)

• Status Locked bits (ICSL)

• Status Stable bits (ICSS)

OSCCON: OSCILLATOR CONTROL REGISTER

U-0

R/W-1

R/W-0

R-q

U-0

—

IRCF1

IRCF0

ICSL

ICSS

—

bit 7

bit 0

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

-n = Value at POR

‘1’ = Bit is set

‘0’ = Bit is cleared

x = Bit is unknown

q = Value depends on condition

bit 7-6

Unimplemented: Read as ‘0’

bit 5-4

IRCF<1:0>: Internal Oscillator Frequency Select bits

When PLLEN = 1 (16 MHz HFINTOSC)

=16 MHz

= 8 MHz (POR value)

=4 MHz

=2 MHz

When PLLEN = 0 (500 kHz MFINTOSC)

= 500 kHz

= 250 kHz (POR value)

= 125 kHz

= 62.5 kHz

bit 3

ICSL: Internal Clock Oscillator Status Locked bit (2% Stable)

= 16 MHz/500 kHz internal oscillator is in lock

= 16 MHz/500 kHz internal oscillator has not yet locked

bit 2

ICSS: Internal Clock Oscillator Status Stable bit (0.5% Stable)

= 16 MHz/500 kHz internal oscillator has stabilized to its maximum accuracy

= 16 MHz/500 kHz internal oscillator has not yet reached its maximum accuracy

bit 1-0

Unimplemented: Read as ‘0’

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