Datasheet

PIC18F66K80 FAMILY

DS39977F-page 62  2010-2012 Microchip Technology Inc.

R/W-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

ROON

— ROSSLP ROSEL

(1)

RODIV3 RODIV2 RODIV1 RODIV0

bit 7 bit 0

Legend:

R = Readable bit W = Writable 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 ROON: Reference Oscillator Output Enable bit

1 = Reference oscillator output is available on REFO pin

0 = Reference oscillator output is disabled

bit 6 Unimplemented: Read as ‘0’

bit 5 ROSSLP: Reference Oscillator Output Stop in Sleep bit

1 = Reference oscillator continues to run in Sleep

0 = Reference oscillator is disabled in Sleep

bit 4 ROSEL: Reference Oscillator Source Select bit

(1)

1 = Primary oscillator (EC or HS) is used as the base clock

0 = System clock is used as the base clock; base clock reflects any clock switching of the device

bit 3-0 RODIV<3:0>: Reference Oscillator Divisor Select bits

1111 = Base clock value divided by 32,768

1110 = Base clock value divided by 16,384

1101 = Base clock value divided by 8,192

1100 = Base clock value divided by 4,096

1011 = Base clock value divided by 2,048

1010 = Base clock value divided by 1,024

1001 = Base clock value divided by 512

1000 = Base clock value divided by 256

0111 = Base clock value divided by 128

0110 = Base clock value divided by 64

0101 = Base clock value divided by 32

0100 = Base clock value divided by 16

0011 = Base clock value divided by 8

0010 = Base clock value divided by 4

0001 = Base clock value divided by 2

0000 = Base clock value

Note 1: For ROSEL (REFOCON<4>), the primary oscillator is available only when configured as the default via the

FOSCx settings. This is regardless of whether the device is in Sleep mode.