The 12F609 internal ocs runs at 4MHz or 8MHz. IOSCFS: Internal Oscillator Frequency Select bit in the config register is used to select 4 or 8MHz.

@ DEVICE PIC12F609, MCLR_OFF, IOSCFS_4MHZ, INTRC_OSC_NOCLKOUT

@ DEVICE PIC12F609, MCLR_OFF, IOSCFS_8MHZ, INTRC_OSC_NOCLKOUT