Zilog Z80380 Bedienungsanleitung PDF herunterladen (Seite 54)

5-20

Z380

™

USER'S MANUAL

DC-8297-03

ZILOG

ADC

ADD WITH CARRY (BYTE)

ADC A,src src = R, RX, IM, IR, X

Operation: A ← A + src + C

The source operand together with the Carry flag is added to the accumulator and the sum

is stored in the accumulator. The contents of the source is unaffected. 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 both operands cleared otherwise

N: Cleared

C: Set if there is a carry from the most significant bit of the result; cleared otherwise

Addressing Execute

Mode Syntax Instruction Format Time Note

R: ADC A,R 10001-r- 2

RX: ADC A,RX 11y11101 1000110w 2

IM: ADC A,n 11001110 —n— 2

IR: ADC A,(HL) 10001110 2+r

X: ADC A,(XY+d) 11y11101 10001110—d— 4+r I

Field Encodings: r: per convention

y: 0 for IX, 1 for IY

w: 0 for high byte, 1 for low byte

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Zilog Z80380 Bedienungsanleitung Seite 54