PIC18F2455T-I/ML View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC18F2455T-I/ML

28/40/44-Pin, High-Performance, Enhanced Flash, USB Microcontrollers with nanoWatt Technology

Microchip Technology 

PIC18F2455/2550/4455/4550

REGISTER 25-2: CONFIG1H: CONFIGURATION REGISTER 1 HIGH (BYTE ADDRESS 300001h)

R/P-0

R/P-0

U-0

IESO

FCMEN

—

bit 7

U-0

R/P-0

R/P-1

R/P-0

R/P-1

—

FOSC3(1)

FOSC2(1)

FOSC1(1) FOSC0(1)

bit 0

Legend:

R = Readable bit

P = Programmable bit

-n = Value when device is unprogrammed

U = Unimplemented bit, read as ‘0’

u = Unchanged from programmed state

bit 7

bit 6

bit 5-4

bit 3-0

IESO: Internal/External Oscillator Switchover bit

1 = Oscillator Switchover mode enabled

0 = Oscillator Switchover mode disabled

FCMEN: Fail-Safe Clock Monitor Enable bit

1 = Fail-Safe Clock Monitor enabled

0 = Fail-Safe Clock Monitor disabled

Unimplemented: Read as ‘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.

DS39632E-page 294

© 2009 Microchip Technology Inc.

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