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The control signal ALE is sent by Intel 8085 in order to
1. Inform I/O device that address is being sent over the AD Line
2. achieve separation of address from data
3. inform the memory device that address is being sent over the AD line
4. inform I/O and memory that data is being sent over the AD line

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Correct Answer - Option 2 : achieve separation of address from data

ALE: (Address Latch Enable):

  • It is an active high output signal.
  • It indicates that the bits on AD7 - AD0 are address bits
  • This signal is used to latch the lower order address from the multiplexed bus and generate a separate set of eight address lines A7 – A0
  • It is provided by the microprocessor to latch the address into the 8282 / 8283 address latch.
  • It is a high pulse active during T1 of any machine cycle. The T1 state is sufficient enough to latch the address on the multiplexed AD0 - AD15 lines.
  • Whenever the processor sends a valid address on the multiplexed lines it also makes the ALE High.
  • ALE is never floated.
  • ALE is used to demultiplexed/multiplexed data buses and address buses.


Note:

The 8085 microprocessor signals can be classified into various groups, namely:

1. address bus,

2. data bus

3. control bus 

4. status signals,

5. externally initiated signals

6. acknowledgement, power and frequency

7. serial I/O signals.

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