Zilog EZ80F916 - Manual (Page 129)

eZ80
®
CPU
User Manual
UM007715-0415 CPU Instruction Set
120
CP A, (IX/Y+d)
Compare with Accumulator
Operation
A–(IX/Y+d)
Description
The (IX/Y+d) operand is the 8-bit value stored in the memory location specified by the
contents of the Index Register, IX or IY, added to the two’s-complement displacement d.
This 8-bit value is compared with (subtracted from) the contents of the accumulator, A.
The execution of this instruction does not affect the contents of the accumulator or the
(IX/Y+d) operand.
Condition Bits Affected
Attributes
S
Set if result is negative; reset otherwise.
Z
Set if A = (IX/Y+d); reset otherwise.
H
Set if borrow from bit 4; reset otherwise.
P/V
Set if overflow: reset otherwise.
N
Set.
C
Set if borrow; reset otherwise.
Mnemonic Operand ADL Mode Cycle Opcode (hex)
CP
A,(IX+d) X 4
DD, BE, dd
CP.S
A,(IX+d) 1 5
52, DD, BE, dd
CP
.L A,(IX+d) 0 5
49, DD, BE, dd
CP
A,(IY+d) X 4
FD, BE, dd
CP.S
A,(IY+d) 1 5
52, FD, BE, dd
CP
.L A,(IY+d) 0 5
49, FD, BE, dd