The function of ALE signal in 8051 microcontroller is

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VSSC (ISRO) Technician B: Electronic Mechanic Previous Year Paper (Held on 10 Dec 2017)
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  1. To extend the memory capacity
  2. To control demultiplexing the address and data bus.
  3. To distinguish between external RAM and PROM
  4. To initialize parallel port

Answer (Detailed Solution Below)

Option 2 : To control demultiplexing the address and data bus.
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Detailed Solution

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ALE:

The Pin 30 of 8051 microcontroller is used for ALE that is Address Latch Enable.

  • It is an active-high input control signal.
  • ALE signal is used for demultiplexing the multiplexed Address/Data bus of Port 0 during external memory interfacing.
  • In each machine cycle, there are 2 ALE pulses
  • ALE is also used to check whether the device is working or not.
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