Question

In Intel 8085 Microprocessor, ALE signal is made high to ______.

Options

• enable AD₀ − AD₇ bus to be used as lower order address bus. 

• enable A8 − A15 bus to be used as lower order data bus.

• to halt the processor

• to reset the microprocessor

Answer 1

In Intel 8085 Microprocessor, ALE signal is made high to enable AD₀ − AD₇ bus to be used as lower order address bus.

Explanation:

ALE (Address Latch Enable) is a positive pulse generated at the start of a machine cycle to indicate that the lines AD₇ – AD₀ are carrying the low-order address; an external latch uses ALE to capture the address, and after ALE goes low, the AD lines are reused as the data bus.