PIC18F1220ESLASHSSSQTP datasheet(174/308 Pages) MICROCHIP

174 / 308 page

PIC18F1220/1320

DS39605F-page 172

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

R/P-1

U-0

R/P-1

IESO

FSCM

—

FOSC3

FOSC2

FOSC1

FOSC0

bit 7

bit 0

bit 7

IESO: Internal External Switchover bit

= Internal External Switchover mode enabled

= Internal External Switchover mode disabled

bit 6

FSCM: 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

FOSC<3:0>: Oscillator Selection bits

11xx

= External RC oscillator, CLKO function on RA6

1001

= Internal RC oscillator, CLKO function on RA6 and port function on RA7

1000

= Internal RC oscillator, port function on RA6 and port function on RA7

0111

= External RC oscillator, port function on RA6

0110

= HS oscillator, PLL enabled (clock frequency = 4 x FOSC1)

0101

= EC oscillator, port function on RA6

0100

= EC oscillator, CLKO function on RA6

0010

= HS oscillator

0001

= XT oscillator

0000

= LP oscillator

Legend:

R = Readable bit

P = Programmable bit

U = Unimplemented bit, read as ‘0’

-n = Value when device is unprogrammed

u = Unchanged from programmed state

PIC18F1220E/SSSQTP 데이터시트(PDF) 174 Page - Microchip Technology

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