I programmed my M48 with an external crystal setting in AVRStudio and I am using an 8MHz crystal on my breadboard. What is a good and easy way to verify if it is using the external 8MHz crystal and not the internal RC oscillator? Will measuring clkout be a good idea? I don't have a O-scope so is there any other way to confirm what clock source the M48 is using? Also as my "test" circuit I am driving a simple LED from portB.