can i use internal 1Mhz while 8 Mhz crystal is already connected to the atmega8 osc pins?
can i use internal 1Mhz while 8 Mhz crystal is already conne
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Yes.
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Location: (using avr-gcc in) Finchingfield, Essex, England
Just to add that to do so you may have to change the CKSEL fuses (depending how they are currently set).