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ROL: Difference between revisions

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=== External Links ===
=== External Links ===
* [[Eyes & Lichty]] page 490, on ROL: https://archive.org/details/0893037893ProgrammingThe65816/page/490
* [[Eyes & Lichty]] page 490, on ROL: https://archive.org/details/0893037893ProgrammingThe65816/page/490
* lbid page 190 before & after diagram of ROL: https://archive.org/details/0893037893ProgrammingThe65816/page/n216
* lbid page 190 before & after diagram of ROL: https://archive.org/details/0893037893ProgrammingThe65816/page/190
* [[Labiak]] page 174 on ROL: https://archive.org/details/Programming_the_65816/page/n184
* [[Labiak]] page 174 on ROL: https://archive.org/details/Programming_the_65816/page/n184
* [[MCS6500 Manual]] page 149 on ROL: https://archive.org/details/mos_microcomputers_programming_manual/page/n170
* [[MCS6500 Manual]] page 149 on ROL: https://archive.org/details/mos_microcomputers_programming_manual/page/n170

Revision as of 01:54, 24 July 2024

Basic Info
Addressing Mode Opcode Length Speed
Accumulator 2A 1 byte 2 cycles
Absolute 2E 3 bytes 6 cycles*
Direct Page 26 2 bytes 5 cycles*
Absolute Indexed by X 3E 3 bytes 7 cycles*
Direct Page Indexed by X 36 2 bytes 6 cycles*
Flags Affected
N V M X D I Z C
. . . . .

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

ROL
ROL A
ROL addr
ROL dp
ROL addr, X
ROL dp, X
Cycle Penalties

816 rol.png

See Also

External Links