The ATmega2560 however a problem - they ran out of registers in the low I/O space (the bit set clear test instructions only work on the first 32 addresses). If(VPORTB.OUT & 0x01) // 1 word 1 clock for the test, and 1 word for an rjmp (2 if it for some reason needs a jump, but the linker rarely does), just like beforeĤ. VPORTB.OUT |= 3 //3 word, 3 clocks, and not atomic. VPORTB.OUT = 1 // 2 word 2 clock *and not atomic* VPORTB.OUT |= 1 // 1 word and 1 clock (sbi/cbi got faster!) Those are in the low I/O space, and can be accessed like the old PORTx/DDRx/INx registers: The Arduino Mega 2560 is a microcontroller board based on the ATmega2560.
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