Datasheet

PIC18F87J50 FAMILY

R/WO-1 R/WO-1 U-0 U-0 U-0 R/WO-1 R/WO-1 R/WO-1

IESO FCMEN

— — — FOSC2 FOSC1 FOSC0

bit 7 bit 0

Legend:

R = Readable bit WO = Write-Once bit U = Unimplemented bit, read as ‘0’

-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown

bit 7 IESO: Two-Speed Start-up (Internal/External Oscillator Switchover) Control bit

1 = Two-Speed Start-up enabled

0 = Two-Speed Start-up disabled

bit 6 FCMEN: Fail-Safe Clock Monitor Enable bit

1 = Fail-Safe Clock Monitor enabled

0 = Fail-Safe Clock Monitor disabled

bit 5-3 Unimplemented: Read as ‘0’

bit 2-0 FOSC2:FOSC0: Oscillator Selection bits

111 = ECPLL oscillator with PLL enabled, CLKO on RA6, ECPLL oscillator used by USB

110 = EC oscillator with CLKO on RA6 , EC oscillator used by USB

101 = HSPLL oscillator with PLL enabled, HSPLL oscillator used by USB

100 = HS oscillator, HS oscillator used by USB

011 = INTOSCPLLO, internal oscillator with INTOSCPLL enabled, CLKO on RA6 and port function

RA7

010 = INTOSCPLL, Internal oscillator with Port function on RA6 and RA7

001 = INTOSCO internal oscillator block (INTRC/INTOSC) with CLKO on RA6 Port function on RA7

000 = INTOSC internal oscillator block (INTRC/INTOSC) Port function on RA6 and RA7