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So I just started learning AVR and I am currently working with the ATMega328P. I have a question regarding the CPU clock. Currently I am using the 8MHz internal clock. Now I know that F_CPU tells the compiler what my clock speed is. The problem here is that the CLKDIV8 fuse is programmed by default, so I was wondering what value would I enter for F_CPU? Will it be 8000000 or 1000000.

I would be glad if someone could clear this confusion.

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1Mhz, until/unless you change the CLKDIV8 fuse, then it's 8MHz

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