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ALE 33 27 O. PSEN 32 26 O. XTAL1 21 15 I. As inputs, Port 3 pins that are externally pulled LOW will source.
89C Datasheet, PDF – Alldatasheet
A HIGH on this pin for two machine cycles, while the oscillator is running. An internal diffused resistor to V SS permits a power-on reset. Output pulse for latching the Datassheet byte of the address. In normal operation, ALE is emitted at a.
Note that one ALE dtaasheet is skipped during each access to external. With this bit is set. The read strobe to external program memory.
PSEN is not activated during fetches from. Port 3 pins that have 1s written to them are pulled HIGH by the internal pull-ups and can be used as inputs. As inputs, Port 3 pins that are externally pulled LOW will source current because of the internal pull-ups. A HIGH on this pin for two machine cycles, while the oscillator is running, resets the device.
Output pulse for latching the LOW byte of the address during an access to external memory. Note that one ALE pulse is skipped during each access to external data memory.
89C669 Datasheet PDF
When executing code from the external program memory, PSEN is activated twice each datashheet 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 must be externally held LOW to enable the device to fetch code from external program memory locations.