The micros( ) in wiring.c function using the the variable timer0_millis, which is defined volatile unsigned long timer0_millis , the maximum value is oxFFFFFFFF . It adds MILLIS_INC on each Timer0 interrupt(at 12MHZ clock, the MILLIS_INC = 1). After (0xFFFFFFFF/MILLIS_INC) Timer0 interupts, timer0_m…

"Year 2000 problem" in Arduino

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