Zilog Z80380 - Manual (Page 195)

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Z380 ™
U SER ' S M ANUAL Z ILOG
DC-8297-03
SBCW
SUBTRACT WITH CARRY (WORD)
SBCW [HL,]src src = R, RX, IM, X
Operation: HL(15-0)
←
HL(15-0) - src(15-0) - C
The source operand together with the Carry flag is subtracted from the HL register and the
difference is stored in the HL register. The contents of the source are unaffected. Two's
complement subtraction is performed.
Flags: S: Set if the result is negative; cleared otherwise
Z: Set if the result is zero; cleared otherwise
H: Set if there is a borrow from bit 12 of the result; cleared otherwise
V: Set if arithmetic overflow occurs, that is, if the operands are of different signs and the
result is of the same sign as the source; cleared otherwise
N: Set
C: Set if there is a borrow from the most significant bit of the result; cleared otherwise
Addressing Execute
Mode Syntax Instruction Format Time Note
R: SBCW [HL,]R 11101101 100111rr 2
RX: SBCW [HL,]RX 11y11101 10011111 2
IM: SBCW [HL,]nn 11101101 10011110 -n(low) -n(high)- 2
X: SBCW [HL,](XY+d) 11y11101 11011110 ——d— 4+r I
Field Encodings: rr: 00 for BC, 01 for DE, 11 for HL
y:
0 for IX, 1 for IY