ROR: Difference between revisions

Revision as of 17:28, 13 July 2023


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 Clobbered
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.

External Links

Eyes & Lichty page on ROR: https://archive.org/details/0893037893ProgrammingThe65816/page/n517
Labiak page on ROR: https://archive.org/details/Programming_the_65816/page/n185
MCS6500 Manual page on ROR: https://archive.org/details/mos_microcomputers_programming_manual/page/n171
Carr page on ROR: https://archive.org/details/6502UsersManual/page/n282
Leventhal page on ROR: https://archive.org/details/6502-assembly-language-programming/page/n136
snes9x implementation of ROR: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L1070
undisbeliever on ROR: https://undisbeliever.net/snesdev/65816-opcodes.html#ror-rotate-right

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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.
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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.
 === See Also ===