eZ80
®
CPU
User Manual
UM007714-0908 CPU Instruction Set
330
SBC A, ir
Subtract with Carry
Operation
A ← A – ir – C
Description
The
rr
operand is any of the 8-bit registers IXH, IXL, IYH, IYL. The
ir
operand and the
Carry Flag (C) are subtracted from the contents of the accumulator, A. The result is writ-
ten 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,IXH X 2 DD, 9C
SBC A,IXL X 2 DD, 9D
SBC A,IYH X 2 FD, 9C
SBC A,IYL X 2 FD, 9D
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