11
Ze r o Pa g e Y
Ad d r e s s in g m o d e :
F u n c tio n :
In s tr u c tio n s :
Ex a m p le :
IN STRUC TION S
Zero Page Y
Specifies the contents in a Zero Page memory
location as the data for the instruction. The address
in the Zero Page memory location is determined by
the following:
(a) Operand and the Index Register Y are added (if as
a result of this addition a carry occurs, it is ig-
nored).
(b) The result of the addition is used as the low-order
byte of the address and 00
16
as the high-order
byte.
LDX, STX
Mnemonic
Machine code
∆
LDX
∆
$62,Y
B6
16
62
16
Addressing mode
68
16
00
16
AAAAAA
AAAAAA
AAAAAA
AAAAAA
AAAAAA
AAAAAA
AAAAAA
AAAAAA
AAAAAA
Zero page
Data(XX
16
)
FF
16
Op-code (B6
16
)
Operand (62
16
)
(X)
←
XX
16
+ 06
16
= 68
16
Zero page Y
designation
Memory
Contents of Index Register Y
