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LDY
(M : M + 1) ⇒ Y
Operation:
Description:
Loads the most significant byte of index register Y with the content of
memory location M, and loads the least significant byte of Y with the con-
tent of the next memory location at M + 1.
Condition Codes and Boolean Formulas:
S
–
N:
Z:
V:
Addressing Modes, Machine Code, and Execution Times:
Source Form
LDY # opr16i
LDY opr8a
LDY opr16a
LDY oprx0_xysp
LDY oprx9,xysp
LDY oprx16,xysp
LDY [D ,xysp ]
LDY [ oprx16,xysp ]
CPU12
REFERENCE MANUAL
Load Index Register Y
X
H
I
N
Z
∆
∆
–
–
–
Set if MSB of result is set; cleared otherwise.
Set if result is $0000; cleared otherwise.
0; Cleared.
Address Mode
IMM
DIR
EXT
IDX
IDX1
IDX2
[D,IDX]
[IDX2]
INSTRUCTION GLOSSARY
V
C
0
–
Object Code
CD jj kk
DD dd
FD hh ll
ED xb
ED xb ff
ED xb ee ff
ED xb
ED xb ee ff
LDY
Cycles
Access Detail
2
OP
3
RfP
3
ROP
3
RfP
3
RPO
4
fRPP
6
fIfRfP
6
fIPRfP
MOTOROLA
6-127
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