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Clock cycle frequency is one-half the crystal frequency. Referred to as E-clock. EVM crystal frequency is 16 MHz.
What is the period of the E-clock on the EVM? Answer in microseconds. 1/(16MHz/2) = 0.125 microseconds
One memory access cycle can be completed with every E-clock. When accessing internal memory, either ROM or RAM, the processor can read up to two bytes with every memory access.