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Programmable Serial Channel 8-bit Microcontroller

Programmable Serial Channel 8-bit Microcontroller

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effect if the microcontroller is in external execution mode. PSEN Program Store Enable is the read strobe to external pro-gram memory. When the AT89C51 is executing code from external pro-gram memory, PSEN is activated twice each machine cycle, except that two PSEN activations are skipped during each access to external data memory. EA/VPP

  Microcontrollers

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