address latch enable...in the case of microcontroller (8051)

& microprocessor 8085 the data line & low order 8 bit

address lines are multiplexed.in order to geting address

from this line we uses a latch.ALE is the line connected to

this latch saying that the take the address from the line.

NB: this is used only when we connecting our micro

controller to external mem.