What is the size of the instruction MVI C,ffh? A) 1byte B) 2byte C) 3byte D) 4byte

1. Break Down the Problem

We need to determine the size of the instruction MVI C, ffh. This instruction is part of the instruction set for an 8085 microprocessor.

2. Relevant Concepts

• The MVI (Move Immediate) instruction syntax is generally in the form MVI <register>, <data>.
• The instruction consists of:
  1. An opcode (which indicates the operation).
  2. The operands (which include the register and the immediate data).

3. Analysis and Detail

1. Opcode Size: The MVI instruction has a specific opcode that typically occupies 1 byte.
2. Operand Size:
   • The destination register (C in this case) requires no additional bytes for storage.
   • The immediate data (ffh) takes 1 byte.
3. Total Size Calculation:
   • Size of Opcode = 1 byte
   • Size of Operand (immediate data) = 1 byte
   • Total Size = Opcode Size + Operand Size = 1 byte + 1 byte = 2 bytes

4. Verify and Summarize

Upon analyzing the instruction and its components, we find that the total size of the instruction MVI C, ffh is indeed 2 bytes.

Final Answer

The size of the instruction MVI C, ffh is B) 2 bytes.