23define f cpu

1#define F_CPU 1000000                   // We start with 8x prescaler on 8Mhz clock
2
3#define delay_ms_1Mhz(x) (_delay_ms(x))   // Delay when prescaller set to 8x
4#define delay_ms_8Mhz(x) (_delay_ms(x*8)) // Delay when prescaller set to 1x so we need to burn 8x as many cycles
5