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MJ-80C32E-30 Arkusz danych(PDF) 4 Page - AIMTEC |
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MJ-80C32E-30 Arkusz danych(HTML) 4 Page - AIMTEC |
4 / 20 page 4 80C32E 4149M–AERO–06/03 ALE O (I) Address Latch Enable: Output pulse for latching the low byte of the address during an access to external memory. In normal operation, ALE is emitted at a constant rate of 1/6 the oscillator frequency, and can be used for external timing or clocking. Note that one ALE pulse is skipped during each access to external data memory. PSEN O Program Store ENable: The read strobe to external program memory. When executing code from the external program memory, PSEN is activated twice each machine cycle, except that two PSEN activations are skipped during each access to external data memory. PSEN is not activated during fetches from internal program memory. EA I External Access Enable: EA must be externally held low to enable the device to fetch code from external program memory locations. XTAL1 I Crystal 1: Input to the inverting oscillator amplifier and input to the internal clock generator circuits. XTAL2 O Crystal 2: Output from the inverting oscillator amplifier Mnemonic Type Name and Function |
Podobny numer części - MJ-80C32E-30 |
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Podobny opis - MJ-80C32E-30 |
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