4438784
Description
Mind Map by Timothy Herschell, updated more than 1 year ago
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Created by Timothy Herschell
over 9 years ago
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Machine code instructions
- Computers can ONLY understand machine code, 0s and 1s.
Therefore, all instructions are written in machine code.
- An instruction code is written in the form
0101 01 01001101
- Op codes
- The 1st four binary digits are the 'op code'. Op
codes are operations the computer has been
coded to do automatically.
- For example, the code 0101 could make the
computer copy a register to a memory location.
- For example, the code 0101 could make the
computer copy a register to a memory location.
- The 1st four binary digits are the 'op code'. Op
codes are operations the computer has been
coded to do automatically.
- Registers
- All computers have registers. They are
a volatile area to store data.
- Computers have different amounts of registers. If the
register number is 2 digits long, the computer has only 4.
- Computers have different amounts of registers. If the
register number is 2 digits long, the computer has only 4.
- All computers have registers. They are
a volatile area to store data.
- Operands
- The operands are the data or memory
location actually being used in the operation
- The operands are the data or memory
location actually being used in the operation
- Op codes
- An instruction code is written in the form
0101 01 01001101
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