ZiLOG eZ80 - Page 340

eZ80
®
CPU
User Manual
UM007714-0908 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