Discussion
8051 has 8 bit data bus, but it can generate 16 bit addresses using :
Answer: B
The 8051 generates 16-bit addresses with the help of ALE.
Port 0 of the 8051 is multiplexed: it first carries the low byte of the address (A0-A7) and then the data byte. The Address Latch Enable (ALE) pulse tells an external latch (such as a 74LS373) to capture the low address byte, while port 2 supplies the high byte (A8-A15). Together they form the 16-bit address even though the data bus is only 8 bits.
IO/M is an 8085 signal, and R/W is a generic read-write line, neither of which latches addresses. The EA pin selects whether the 8051 executes from internal or external program memory.
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