eZ80
®
CPU
User Manual
UM007714-0908 CPU Instruction Set
333
SBC A, r
Subtract with Carry
Operation
A ← A – r – C
Description
The
r
operand is any of the 8-bit CPU registers A, B, C, D, E, H, or L. The
r
operand 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
jj identifies the A, B, C, D, E, H, or L register and is assembled into one of the opcodes
indicated in Table 94.
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,r X1jj
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