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LSR: Difference between revisions

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'''LSR''' (Logical Shift Right) is a 65x instruction that shifts a value one bit to the right (division by two).  The most significant bit becomes a zero.  The least significant bit is shifted into the [[carry flag]].
'''LSR''' (Logical Shift Right) is a 65x instruction that shifts a value one bit to the right (division by two).  The most significant bit becomes a zero.  The least significant bit is shifted into the [[carry flag]].
{| class="wikitable" style="float:right;clear:right;width:30%"
!colspan="8"|Basic Info
|+
|'''Addressing Mode'''
|'''Opcode'''
|'''Length'''
|'''Speed'''
|+
|accumulator
|4A
|1 byte
|2 cycles
|+
|absolute
|4E
|3 bytes
|6 cycles
|+
|direct page
|46
|2 bytes
|5 cycles
|+
|absolute indexed X
|5E
|3 bytes
|7 cycles
|+
|direct page indexed X
|56
|2 bytes
|6 cycles
|}


{| class="wikitable" style="width:30%"
{| class="wikitable" style="width:30%"
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|C
|C
|+
|+
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|0
|.
|.
|.
|.

Revision as of 17:58, 1 May 2023

LSR (Logical Shift Right) is a 65x instruction that shifts a value one bit to the right (division by two). The most significant bit becomes a zero. The least significant bit is shifted into the carry flag.

Basic Info
Addressing Mode Opcode Length Speed
accumulator 4A 1 byte 2 cycles
absolute 4E 3 bytes 6 cycles
direct page 46 2 bytes 5 cycles
absolute indexed X 5E 3 bytes 7 cycles
direct page indexed X 56 2 bytes 6 cycles
Flags Clobbered
N V M X D I Z C
0 . . . . .
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