Discussion
In 8051, Pin 30 (ALE / \(\overline{\text{PROG}}\)), if this bit is set as logic zero (‘0’), it signifies
Answer: B
The key takes the answer as option (B), for enabling the internal ROM for programming. Pin 30 of the 8051 is ALE, which is used as the address latch enable during normal work. The same pin takes the programming pulse, PROG, with an overbar because it is active low, when the on-chip program memory is being programmed. The key reads a logic zero on this pin as the condition that enables programming of the internal ROM. Option (A), address is latched, belongs to the ALE function when it is high. Option (C), disabling programming, is the opposite of the key. Option (D) combines (A) and (C). The wording of the item is loose, so it follows the key.
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