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Module 4: Memory and I/O Interfacing

20202m

How does the microcontroller communicate with the external peripherals/memory?
(i) Via I/O ports
(ii) Via register arrays
(iii) Via memory
(iv) All of the above

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Answer: (i) Via I/O ports

Explanation: 8051 communicates with external peripherals/memory via its 32 I/O lines (P0-P3). Port 0 & Port 2 provide multiplexed address/data buses, Port 3 provides control signals (RD, WR), while data transfer occurs through port pins. Register arrays are internal.

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