Question
What is the machine code that corresponds to the AVR Assembly Language Instruction and r31, r0...
What is the machine code that corresponds to the AVR Assembly
Language Instruction
and r31, r0
(Enter your answer as a 16 bit binary number. There must be no
spaces or punctuation marks - just enter sixteen 1's or 0's.)
Homework Answers
Answer #1
Convert the following AVR Assembly Language Instruction to machine code:
and r31, r0
Answer: 0010000111110000 (Binary)
Description:
• Instruction: and - Logical AND
• Instruction Format: and Rd, Rr
The above instruction performs the Logical AND between Rd and Rr register and place the result in Rd register. Here, 0 ≤ r ≤ 31 and 0 ≤ d ≤ 31.
Rd ← Rd • Rr or Rd ← Rd AND Rr
• 16-bit opcode: and r31, r0
• Here, opcode for and is: 001000 (bits 15 - 10)
• Register Rr = r0. So, r rrrr is 00000 (bit 9 and bits 3 - 0)
• Register Rd = r31. So, d dddd is 11111 (bits 8 - 4)
• So, 16-bit Binary machine code is: 0010000111110000.
Hexadecimal: 0x21F0
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