Instruction Reference Manual 93
Description
Subtracts the Carry Flag, CF, and the data whose address is:
• the data in word register HL, or
• the sum of the data in index register IX and a displacement d,or
• the sum of the data in index register IY and a displacement d
from the data in the Accumulator. The result is stored in the Accumulator.
These operations output an inverted carry:
• The Carry Flag is set if the Accumulator is less than the data being subtracted from it.
• The Carry Flag is cleared if the Accumulator is greater than the data being subtracted from it.
SBC A,(HL)
SBC (IX+d)
SBC (IY+d)
Opcode Instruction Clocks Operation
9E SBC A,(HL) 5 (2,1,2) A = A - (HL) - CF
DD 9E d SBC (IX+d) 9 (2,2,2,1,2) A=A-(IX+d)-CF
FD 9E d SBC (IY+d) 9 (2,2,2,1,2) A=A-(IY+d)-CF
Flags ALTD I/O
S Z L/V C F R SP S D
• • V • • • •
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