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Я не проверял, но в даташитах есть отличия, привожу со страницами.
AT90S4433:(p.35)
"The Timer/Counter0 is realized as an up-counter with read and write access. If the Timer/Counter0 is written and a clock source is present, the Timer/Counter0 continues counting in the clock cycle following the write operation."
ATMega8:(p.68)
"However, the TCNT0 value can be accessed by the CPU, regardless of whether clk T0 is present or not. A CPU write overrides (has priority over) all counter clear or count operations."
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