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Module 2: The 8051 Architecture

20242m

What is the function of ALE signal in 8051?
(i) Latches lower address byte
(ii) Enables timers
(iii) Selects internal memory
(iv) Controls interrupt

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Answer: (i) Latches lower address byte

Explanation: ALE = Address Latch Enable. In multiplexed mode (Port 0 = AD0-AD7), ALE pulses high to enable external latch (74LS373) to capture low-order address byte (A0-A7) at beginning of machine cycle; data then appears on same port. It does not enable timers, select internal memory, or control interrupts.

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