PIC16C54C-04/P【PDF 106/194 页】IC MCU OTP 512X12 18DIP

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Sheet目录3887

102页 103页 104页 105页 [106页]107页 108页 109页 110页

PIC18F2450/4450

DS39760A-page 192

Advance Information

2006 Microchip Technology Inc.

REGISTER 18-2:

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

R/P-0

U-0

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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