ROL: Difference between revisions

Revision as of 17:27, 13 July 2023


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 Clobbered
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.

External Links

Eyes & Lichty page on ROL: https://archive.org/details/0893037893ProgrammingThe65816/page/n516
Labiak page on ROL: https://archive.org/details/Programming_the_65816/page/n184
MCS6500 Manual page on ROL: https://archive.org/details/mos_microcomputers_programming_manual/page/n170
Carr page on ROL: https://archive.org/details/6502UsersManual/page/n282
Leventhal page on ROL: https://archive.org/details/6502-assembly-language-programming/page/n134
snes9x implementation of ROL: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L1011
undisbeliever on ROL: https://undisbeliever.net/snesdev/65816-opcodes.html#rol-rotate-left

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-'''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.
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+'''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.
 === See Also ===