the correct syntax and available config word (fuse) settings are available in the pbp3 device_reference folder

File: PIC18F4520.INFO


Code:
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Available configuration settings for PIC18F4520:
;
;
;  Oscillator Selection bits
;    CONFIG OSC = INTIO7     ;Internal oscillator block, CLKO function on RA6, port function on RA7
;    CONFIG OSC = INTIO67     ;Internal oscillator block, port function on RA6 and RA7
;    CONFIG OSC = RCIO6     ;External RC oscillator, port function on RA6
;    CONFIG OSC = HSPLL     ;HS oscillator, PLL enabled (Clock Frequency = 4 x FOSC1)
;    CONFIG OSC = ECIO6     ;EC oscillator, port function on RA6
;    CONFIG OSC = EC     ;EC oscillator, CLKO function on RA6
;    CONFIG OSC = RC     ;External RC oscillator, CLKO function on RA6
;    CONFIG OSC = HS     ;HS oscillator
;    CONFIG OSC = XT     ;XT oscillator
;    CONFIG OSC = LP     ;LP oscillator