PIC18F4550ESOSQTP datasheet(290/430 Pages) MICROCHIP

290 / 430 page

PIC18F2455/2550/4455/4550

DS39632D-page 288

Preliminary

CONFIG1H: CONFIGURATION REGISTER 1 HIGH (BYTE ADDRESS 300001h)

R/P-0

U-0

R/P-0

R/P-1

R/P-0

R/P-1

IESO

FCMEN

—

—FOSC3(1)

FOSC2(1)

FOSC1(1)

FOSC0(1)

bit 7

bit 0

Legend:

R = Readable bit

P = Programmable bit

U = Unimplemented bit, read as ‘0’

-n = Value when device is unprogrammed

u = Unchanged from programmed state

bit 7

IESO: Internal/External Oscillator Switchover bit

= Oscillator Switchover mode enabled

= Oscillator Switchover mode disabled

bit 6

FCMEN: Fail-Safe Clock Monitor Enable bit

= Fail-Safe Clock Monitor enabled

= Fail-Safe Clock Monitor disabled

bit 5-4

Unimplemented: Read as ‘0’

bit 3-0

FOSC3:FOSC0: Oscillator Selection bits(1)

111x

= HS oscillator, PLL enabled (HSPLL)

110x

= HS oscillator (HS)

1011

= Internal oscillator, HS oscillator used by USB (INTHS)

1010

= Internal oscillator, XT used by USB (INTXT)

1001

= Internal oscillator, CLKO function on RA6, EC used by USB (INTCKO)

1000

= Internal oscillator, port function on RA6, EC used by USB (INTIO)

0111

= EC oscillator, PLL enabled, CLKO function on RA6 (ECPLL)

0110

= EC oscillator, PLL enabled, port function on RA6 (ECPIO)

0101

= EC oscillator, CLKO function on RA6 (EC)

0100

= EC oscillator, port function on RA6 (ECIO)

001x

= XT oscillator, PLL enabled (XTPLL)

000x

= XT oscillator (XT)

Note 1:

The microcontroller and USB module both use the selected oscillator as their clock source in XT, HS and

EC modes. The USB module uses the indicated XT, HS or EC oscillator as its clock source whenever the

microcontroller uses the internal oscillator.

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