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#define F_CPU 9600000UL#include <avr/io.h>#include <stdint.h>#include <avr/interrupt.h>int main ( void ){ cli(); DDRB = 0x3f; PORTB = 0x0f; while(1) { } return 0;}
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CKSEL1...0 = 00 -> external clockCKSEL1...0 = 10 -> 9,6MHzCKSEL1...0 = 01 -> 4,8MHzCKSEL1...0 = 11 -> internal 128MHz Clock
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