8051 loop behavior — will the following code execute continuously (infinite loop)? Code at label STAT: STAT: MOV A, #01H JNZ STAT Decide whether execution remains stuck at STAT forever.

Introduction / Context:
Branch-on-zero instructions in the 8051 evaluate the Accumulator directly for JZ/JNZ. Recognizing how the condition is formed helps quickly reason about loop termination or infinite loops during code reviews.

Given Data / Assumptions:

• Code: STAT: MOV A, #01H ; JNZ STAT
• JNZ branches if Accumulator is not zero at the time of evaluation
• No intervening instructions modify A between MOV and JNZ

Concept / Approach:
MOV A, #01H sets A to 1 on every pass. JNZ checks whether A ≠ 0. Since A is 1, the condition is always true, so control jumps back to STAT and repeats the same sequence forever—an infinite loop.

Step-by-Step Solution:

Verification / Alternative check:
If any instruction cleared A before JNZ (e.g., CLR A) or if JNZ tested a different flag, the loop might exit. Here, neither occurs, confirming the infinite loop.

Why Other Options Are Wrong:

• False / loops only once / depends on zero flag semantics: JNZ directly tests A; A remains 1.
• Only if A starts as 0: initial value is overwritten by MOV.

Common Pitfalls:

• Assuming JNZ reads a separate zero flag; it examines the Accumulator value.

Final Answer:
True