Microchip Technology DV164136 Data Sheet
2007-2012 Microchip Technology Inc.
DS39778E-page 45
PIC18F87J11 FAMILY
REGISTER 3-3:
REFOCON: REFERENCE OSCILLATOR CONTROL REGISTER
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
(
)
RODIV3
RODIV2
RODIV1
RODIV0
bit 7
bit 0
Legend:
R = Readable bit
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
= 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:
If ROSEL = 1, an EC or HS oscillator must be configured as the default oscillator with the FOSCx
Configuration bits to maintain clock output during Sleep mode.
Configuration bits to maintain clock output during Sleep mode.