The 8051 has how many I/O ports? (i) 1 (ii) 4 (iii) 2 (iv) 5

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Module 2: The 8051 Architecture

20252m

The 8051 has how many I/O ports?

(i) 1
(ii) 4
(iii) 2
(iv) 5

Worked SolutionAI Assisted

Answer: (ii) 4

Explanation: 8051 has 4 parallel 8-bit I/O ports: Port 0 (P0), Port 1 (P1), Port 2 (P2), Port 3 (P3) → 32 I/O lines total. Each can be used as input/output, with alternate functions on P0, P2, P3.

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