16 bit Assembly
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ROR - Roll Right Instruction
The ROR instruction is used to rotate the bits to the right.
This command has 3 part the Instruction, A Register or memory address, and the number of bits to rotate right.
As each bit is rotated it passes in to the Carry flag, where it can be assessed using a conditional jump JC or JNC.
As each bit moves off the highest bit it is inserted in the lowest bit.
| Assembly Sample | Description | 16 bit Machine Code |
|---|---|---|
| ROR AL, 1 | ; Rotate AL right by 1 bit | D0 C8 |
| ROR AL, CL | ; Rotate AL right by value of CL | D2 C8 |
| ROR AL, 0x03 | ; Rotate AL right by 8 bit immediate | C0 C8 03 |
| ROR AX, 1 | ; Rotate AX right by 1 bit | D1 C8 |
| ROR AX, CL | ; Rotate AX right by value of CL | D3 C8 |
| ROR AX, 0x03 | ; Rotate AX right by 8 bit immediate | C1 C8 03 |
| ROR [BX], 1 | ; Rotate memory address right by 1 bit | D0 0F |
| ROR [BX], CL | ; Rotate memory address right by value of CL | D2 0F |
| ROR [BX], 0x03 | ; Rotate memory address right by 8 bit immediate | C0 0F 03 |
| ROR [BX+2], 1 | ; Rotate memory address right by 1 bit | D0 4F 02 |
| ROR [BX+2], CL | ; Rotate memory address right by value of CL | D2 4F 02 |
| ROR [BX+2], 0x03 | ; Rotate memory address right by 8 bit immediate | C0 4F 02 03 |
Last Update 11/02/2023