Question

With reference to 8085 microprocessor, which of the following statements are correct?

1. INR is 1-byte instruction

2. OUT is 2-byte instruction

3. STA is 3-byte instruction

1. 1 and 2 only
2. 2 and 3 only
3. 1 and 3 only
4. 1, 2 and 3

Answer 1

Correct Answer - Option 4 : 1, 2 and 3

• INR is a 1-byte instruction as it requires 1-Byte, 3-Machine Cycles (Opcode Fetch, Memory Read, Memory Write) and 10 T-States.
• OUT is a 2-byte instruction as it requires 2-Bytes, 3-Machine Cycles (Opcode Fetch, Memory Read, I/O Write) and 10 T-States.
• STA is a 2-byte instruction requires 3-Bytes, 4-Machine Cycles (Opcode Fetch, Memory Read, Memory Read, Memory Write) and 13 T-States.