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ROR

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Basic Info
Addressing Mode Opcode Length Speed
Accumulator 6A 1 byte 2 cycles
Absolute 6E 3 bytes 6 cycles*
Direct Page 66 2 bytes 5 cycles*
Absolute Indexed by X 7E 3 bytes 7 cycles*
Direct Page Indexed by X 76 2 bytes 6 cycles*
Flags Affected
N V M X D I Z C
N . . . . . Z C

ROR (Rotate Right) is a 65x instruction that rotates a value and the carry flag right one bit. The least significant bit is shifted into the carry flag. The carry flag is shifted into the most significant bit.

  • When the accumulator is 8 bits wide, 9 bits are rotated.
  • When the accumulator is 16 bits wide, 17 bits are rotated.

Syntax

ROR
ROR A
ROR addr
ROR dp
ROR addr, X
ROR dp, X
Cycle Penalties

816 ror.png

ROR was originally broken and left out of the earliest 6502 datasheets before fixed.

See Also

External Links