14
IN STRUC TION S
Ab s o lu t 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 :
Absolute Y
Specifies the contents in a memory location as the
data for the instruction. The address in the memory
location is determined by the following:
(a) Operand I is used as the low-order byte of an
address, Operand II as the high-order byte.
(b) Index Register Y is added to the address above.
The result is the address in the memory location.
ADC, AND, CMP, EOR, LDA, LDX, ORA, SBC, STA
Mnemonics
Machine code
∆
ADC
∆
$AD12, Y
79
16
12
16
AD
16
Addressing mode
+ EE
16
= AE00
16
AAAAAA
AAAAAA
Op-code (79
16
)
Operand I (12
16
)
Operand II (AD
16
)
(A)
←
(A) + (C) + XX
16
Data(XX
16
)
Memory
AE00
16
Absolute Y
designation
Contents of Index Register Y
