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ROR: Difference between revisions

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'''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.
'''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.


===== Cycle Penalties =====
===== Cycle Penalties =====

Revision as of 22:57, 28 June 2024

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
. . . . .

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.

Cycle Penalties

ror.png

See Also

External Links