8031 vs. 8051 — key architectural difference Which statement correctly distinguishes the 8031 from the 8051?
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AThe 8031 has no interrupts.
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BThe 8031 is ROM-less.
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CThe 8051 is ROM-less.
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DThe 8051 has 64 bytes more memory.
Answer
Correct Answer: The 8031 is ROM-less.
Explanation
Introduction / Context:The 8031 and 8051 are closely related; however, one is intended for systems with external program memory while the other includes on-chip program ROM. Recognizing this difference helps when selecting parts for cost or board-space constraints.
Given Data / Assumptions:
- Baseline Intel 8051 family definitions.
- 8031 and 8051 share CPU core, timers, serial port, and interrupts.
- Difference centers on on-chip program memory.
Concept / Approach:The classic 8051 contains on-chip program ROM (originally mask ROM, later flash in derivatives). The 8031 is the ROM-less counterpart, requiring external program memory connected to the PSEN, ALE, and Port 0/Port 2 buses.
Step-by-Step Solution:
1) Identify whether each part has internal program memory.2) 8051: has internal program ROM; 8031: no internal program ROM.3) Therefore, the correct statement is that the 8031 is ROM-less.4) Other features (timers/interrupts) are otherwise comparable.Verification / Alternative check:Any standard pinout diagram shows the 8031 using external program memory signals; 8051 can also use external program memory but additionally includes internal ROM.
Why Other Options Are Wrong:
- No interrupts: incorrect; 8031 has interrupts.
- The 8051 is ROM-less: opposite of the truth.
- Extra 64 bytes claim: not the key differentiator between these part numbers.
Common Pitfalls:Confusing RAM size differences in derivatives with the presence/absence of on-chip program memory.
Final Answer:The 8031 is ROM-less.