Zilog Z80380 - Manual (Page 104)

5-70
Z380 ™
U SER ' S M ANUAL
DC-8297-03
Z ILOG
INC
INCREMENT (BYTE)
INC dst dst = R, RX, IR, X
Operation: dst
←
dst + 1
The destination operand is incremented by one and the sum is stored in the destination.
Two’s complement addition 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 carry from bit 3 of the result; cleared otherwise
V: Set if arithmetic overflow occurs, that is, if the destination was 7FH; cleared otherwise
N: Cleared
C: Unaffected
Addressing Execute
Mode Syntax Instruction Format Time Note
R: INC R 00-r-100 note
RX: INC RX 11y11101 0010w100 2
IR: INC (HL) 00110100 2+r+w
X: INC (XY+d) 11y11101 00110100 ——d— 4+r+w I
Field Encodings: r: per convention
y: 0 for IX, 1 for IY
w: 0 for high byte, 1 for low byte
Note: 2 for accumulator, 3 for any other register