Discussion
Match List I with List II and select the correct answer using codes given below the list :
| List I | List II |
|---|---|
| (a) S1 = 0, S0 = 0 | (i) OPCODE FETCH |
| (b) S1 = 0, S0 = 1 | (ii) READ |
| (c) S1 = 1, S0 = 0 | (iii) HALT |
| (d) S1 = 1, S0 = 1 | (iv) WRITE |
Answer: B
The correct matching is a-iii, b-iv, c-ii, d-i.
The 8085 status signals S1 and S0 identify the type of machine cycle:
- S1 = 0, S0 = 0: HALT (iii)
- S1 = 0, S0 = 1: memory or I/O WRITE (iv)
- S1 = 1, S0 = 0: memory or I/O READ (ii)
- S1 = 1, S0 = 1: OPCODE FETCH (i)
Opcode fetch has both bits set, which rules out the code pairing it with 00, and the code that pairs 01 with READ swaps the read and write cycles.
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