PIC18F4520ESLASHMLSTQP datasheet(32/390 Pages) MICROCHIP

32 / 390 page

PIC18F2420/2520/4420/4520

DS39631A-page 30

Preliminary

 2004 Microchip Technology Inc.

OSCCON REGISTER

R/W-0

R/W-1

R/W-0

R(1)

R-0

R/W-0

IDLEN

IRCF2

IRCF1

IRCF0

OSTS

IOFS

SCS1

SCS0

bit 7

bit 0

bit 7

IDLEN: Idle Enable bit

= Device enters Idle mode on SLEEP instruction

= Device enters Sleep mode on SLEEP instruction

bit 6-4

IRCF2:IRCF0: Internal Oscillator Frequency Select bits

111

= 8 MHz (INTOSC drives clock directly)

110

= 4 MHz

101

= 2 MHz

100

= 1 MHz(3)

011

= 500 kHz

010

= 250 kHz

001

= 125 kHz

000

= 31 kHz (from either INTOSC/256 or INTRC directly)(2)

bit 3

OSTS: Oscillator Start-up Time-out Status bit(1)

= Oscillator start-up time-out timer has expired; primary oscillator is running

= Oscillator start-up time-out timer is running; primary oscillator is not ready

bit 2

IOFS: INTOSC Frequency Stable bit

= INTOSC frequency is stable

= INTOSC frequency is not stable

bit 1-0

SCS1:SCS0: System Clock Select bits

= Internal oscillator block

= Secondary (Timer1) oscillator

= Primary oscillator

Note 1: Reset state depends on state of the IESO configuration bit.

2: Source selected by the INTSRC bit (OSCTUNE<7>), see text.

3: Default output frequency of INTOSC on Reset.

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

PIC18F4520E/MLSTQP Datasheet(PDF) 32 Page - Microchip Technology

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