Некорректно считывается TCNT1, ATmega168 Опции

[OlegALL]

Привет.
Проблема: неправильно считывается значение счётного регистра (TCNT1, ATmega168)

описание и код здесь: http://caxapa.ru/480467.html

помогите, горит проект! заранее спасибо

[HNK0]

To do a 16-bit write, the high byte must be written before the low byte.
For a 16-bit read, the low byte must be read before the high byte.

[ILYAUL]

To do a 16-bit write, the high byte must be written before the low byte.
For a 16-bit read, the low byte must be read before the high byte.

И в чём подвох?

[HNK0]

И в чём подвох?

It is important to notice that accessing 16-bit registers are atomic operations. If an interrupt
occurs between the two instructions accessing the 16-bit register, and the interrupt code
updates the temporary register by accessing the same or any other of the 16-bit Timer Registers,
then the result of the access outside the interrupt will be corrupted. Therefore, when both
the main code and the interrupt code update the temporary register, the main code must disable
the interrupts during the 16-bit access.