Highest frequency using Arduino Timers

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Arduino 1 MHz/ 2MHz / 4MHz / 8 MHz CLOCK OUTPUT

Hey everyone So I found this thread where matt_s provided a code to output 8MHz from an Arduino Micro. I want to hook up my Arduino Micro to my GBA's oscillator slot so I can control it's clock speed from the Arduino, with a few buttons. I want to be able to output 1MHz, 2MHz, 4MHz, and 8MHzl. Here is the code that output's 8MHz. All I need is help modifying it to out put 1/2/4 MHz. Thank you! const int freqOutputPin = 9;  // OC1A output pin for ATmega32u4 (Arduino Micro) const int ocr1aval  …