Timer.h

Purpose: Timer/counter widths, modes, clock selections, and capabilities.

Namespace: atmega328p::timer

Timer	Counter	Compare channels	Input capture	Async clock
Timer0	8-bit	2	No	No
Timer1	16-bit	2	Yes	No
Timer2	8-bit	2	No	Yes

#include <atmega328p/Timer.h>
 
namespace mcu = atmega328p;
 
constexpr mcu::timer::Id timer = mcu::timer::Id::Timer1;
constexpr mcu::timer::Timer01Prescaler divider =
    mcu::timer::Timer01Prescaler::Divide64;
 
static_assert(mcu::timer::timer1::counter_bits == 16, "Timer1 width");
static_assert(mcu::timer::timer2::supports_async_clock == 1, "Timer2 async mode");

Timer0 and Timer1 share a prescaler. Timer2 has its own prescaler and can use an asynchronous crystal.