Discussion
The following are features of a micro controller 8051 :
(i) 4 k bytes of ROM or EPROM
(ii) 128 k bytes of data memory
(iii) Four programmable I/O ports
(iv) Three 16 bit timer/event counters.
Answer: A
The key accepts (i), (ii) and (iii), the first option. The 8051 has 4 k bytes of on-chip ROM or EPROM, four programmable 8-bit I/O ports, and a block of on-chip data memory, which in the 8051 is 128 bytes, and this is the statement meant in (ii).
Statement (iv) is wrong for the 8051, which has two 16-bit timer or event counters and not three, the third timer being a feature of the 8052. So the options containing (iv) are wrong.
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