Подскажите, кто точно знает или сталкивался с этим..
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У стандартного MCS-51 максимальная частота по входу таймера = Fкварца/24..
Вопрос: а у однотактовых версий MCS-51 (AT89LP2052/4052) какая?
все понятно?The AT89LP2052/LP4052 has two 16-bit Timer/Counter registers: Timer 0 and Timer 1. As a Timer, the register is incremented every clock cycle. Thus, the register counts clock cycles.
Since a clock cycle consists of one oscillator period, the count rate is equal to the oscillator frequency.
. . .
Since 2 clock cycles are required to recognize a 1-to-0 transition, the maximum count rate is 1/2 of the oscillator frequency. There are no restrictions on the duty cycle of the input signal, but it should be held for at least one full clock cycle to ensure that a given level is sampled at least
once before it changes.