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Module 4: Memory and I/O Interfacing

20202m

How are the address and data buses removed in external memory type of microcontrollers?
(i) Through demultiplexing by external latch & ALE signal
(ii) Through demultiplexing by external latch & DLE signal
(iii) Through multiplexing by external latch & DLE signal
(iv) Through multiplexing by external latch & ALE signal

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Answer: (i) Through demultiplexing by external latch & ALE signal

Explanation: Port 0 multiplexes A0-A7/D0-D7. At start of external memory cycle, ALE high latches A0-A7 into 74LS373. When ALE falls, Port 0 becomes data bus. Thus address and data are demultiplexed using external latch driven by ALE. Not DLE, not multiplexing.

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