+#if CPU_AVR_ATMEGA128 || CPU_AVR_ATMEGA64 || CPU_AVR_ATMEGA103
+ /* These ATMega have different prescaler options. */
+ #define TIMER0_PRESCALER_64 BV(CS02)
+ #define TIMER2_PRESCALER_64 (BV(CS21) | BV(CS20))
+#else
+ #define TIMER0_PRESCALER_64 (BV(CS01) | BV(CS00))
+ #define TIMER2_PRESCALER_64 BV(CS22)
+#endif