Manicka Raja PL Profile Topics Started Replies Created Engagements Search replies: Forum Replies Created Viewing 1 post (of 1 total) Author Posts September 6, 2012 at 7:38 am in reply to: avr usb programmer #8538 Manicka Raja PLParticipant 8 Mhz is Internal Clock, 12 Mhz is External Clock produced by Crystal Oscillator. Author Posts Viewing 1 post (of 1 total)