8085 microprocessor has ____ bit ALU.
2016
8085 microprocessor has ____ bit ALU.
- A.
32
- B.
16
- C.
8
- D.
4
Attempted by 443 students.
Show answer & explanation
Correct answer: C
Answer: 8-bit ALU.
Explanation: The Intel 8085 is an 8-bit microprocessor. Its arithmetic and logic unit (ALU) performs operations on 8-bit operands, which determines the basic data width for arithmetic and logical instructions.
Data bus: 8 bits — the processor transfers 8 bits of data at a time.
Address bus: 16 bits — allows addressing up to 64 KB of memory (separate from ALU width).
Registers and ALU: general-purpose registers and the accumulator are 8-bit, matching the ALU width.
Why the other numeric choices are incorrect:
32: This refers to 32-bit processors, which are from a much later generation; the 8085 is 8-bit.
16: A 16-bit ALU is used in processors such as the Intel 8086; it does not apply to the 8085.
4: A 4-bit ALU describes smaller early microcontrollers or calculators; the 8085 is more capable and is 8-bit.