Zilog EZ80F916 - Manual (Page 340)

eZ80
®
CPU
User Manual
UM007715-0415 CPU Instruction Set
331
SBC A, (IX/Y+d)
Subtract with Carry
Operation
A  A–(IX/Y+d)–C
Description
The (IX/Y+d) operand is an 8-bit value at 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 and the Carry Flag (C) are subtracted from the contents of the accumulator, A. The
result is written to the accumulator.
Condition Bits Affected
Attributes
S
Set if result is negative; reset otherwise.
Z
Set if result is 0; 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)
SBC
A,(IX+d) X 4
DD, 9E, dd
SBC
.S A,(IX+d) 1 5
52, DD, 9E, dd
SBC
.L A,(IX+d) 0 5
49, DD, 9E, dd
SBC
A,(IY+d) X 4
FD, 9E, dd
SBC
.S A,(IY+d) 1 5
52, FD, 9E, dd
SBC
.L A,(IY+d) 0 5
49, FD, 9E, dd