[destination] ← [destination] rotated by <count>
ROXL Dx,Dy
ROXR Dx,Dy
ROXL #<data>,Dy
ROXR #<data>,Dy
ROXL <ea>
ROXR <ea>Size byte, word, longword
Rotate the bits of the operand in the direction indicated. The extend bit of the CCR is included in the rotation. A rotate operation is circular in the sense that the bit shifted out at one end is shifted into the other end. That is, no bit is lost or destroyed by a rotate operation. Since the X-bit is included in the rotate, the rotation is performed over 9 bits (.B), 17 bits (.W), or 33 bits (.L). The bit shifted out is also copied into the C-bit of the CCR as well as the X-bit. The shift count may be specified in one of three ways: the count may be a literal, the contents of a data register or the value 1. An immediate count permits a shift of 1 to 8 places. If the count is in a register, the value is modulo 64 and the range is from 0 to 63. If no count is specified, the word at the specified effective address is rotated by one place (i.e., ROXL <ea>).
| X | N | Z | V | C |
|---|---|---|---|---|
| * | * | * | 0 | * |
The X- and the C-bit are set to the last bit rotated out of the operand. If the rotate count is zero, the X-bit is unaffected and the C-bit is set to the X-bit.
| Dn | An | (An) | (An)+ | ‑(An) | (d,An) | (d,An,Xi) | ABS.W | ABS.L | (d,PC) | (d,PC,Xn) | imm |
|---|---|---|---|---|---|---|---|---|---|---|---|
| ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
From MOTOROLA M68000 FAMILY Programmer's reference manual. Copyright 1992 by Motorola Inc./NXP. Adapted with permission.