afaik the system clock register are protected. Did you used the correct CCP-register unlock procedure? You should use assembler because of the limited access time after CCP unlock
[code:1:10afa0e9fb]$asm
lds r23,OSC_CTRL 'read OSC_CNTRL
andi r23,&B11110111 'clear XOSCEN
ldi r24,&HD8 'Enable access IOREG
out CPU_CCP,r24
sts OSC_CTRL,r23 'write OSC_CTRL
$end asm
[/code:1:10afa0e9fb]
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