Arduino DUEでタイマーを使う

http://2manyprojects.net/timer-interrupts

TIMER_CLOCK1: 84Mhz/2 = 42.000 MHz
TIMER_CLOCK2: 84Mhz/8 = 10.500 MHz
TIMER_CLOCK3: 84Mhz/32 = 2.625 MHz
TIMER_CLOCK4: 84Mhz/128 = 656.250 KHz
TIMER_CLOCK5: SLCK ( slow clock )