1989_MELPS_7700_Software_Manual

LOY
Load Index Register Y from Memory
LOY
Operation
Y(--M
Description
Loads the contents of memory into the index register Y.
Status flags
IPL:
N
v
m
x
D
I
Z
C
Not affected.
Set to 1 when bit 15 (or bit 7 if the index register length selection flag x is set
to 1) of the operation result is 1. Otherwise, cleared to O.
Not affected.
Not affected.
Not affected.
Not affected.
Not affected.
Set to 1 when the result of operation is O. Otherwise, cleared to O.
Not affected.
Addressing mode Syntax Machine code Bytes Cycles
Immediate LOY #imm A016, imm 2 2
Direct LOY dd A416, dd 2 4
Direct indexed X LOY dd, X B416, dd 2 5
Absolute LOY mmll AC16, II, mm 3 4
Absolute indexed X LOY mmll, X BC16, II, mm 3 6
(Note1) When operating on 16-bit data in the immediate addressing mode with the index register length selection
flag x set to 0, the bytes-count increases by 1.
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