Zilog Z80380 Bedienungsanleitung PDF herunterladen (Seite 69)

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Z380

™

USER'S MANUAL

ZILOG

DC-8297-03

CPW

COMPARE (WORD)

CPW [HL,]src src = R, RX, IM, X

Operation: HL(15-0) – src(15-0)

The source operand is compared with the HL register and the flags are set accordingly. The

contents of the HL register and 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: CPW [HL,]R 11101101 101111rr 2

RX: CPW [HL,]RX 11y11101 10111111 2

IM: CPW [HL,]nn 11101101 10111110 -n(low)- n(high)- 2

X: CPW [HL,](XY+d) 11y11101 11111110 ——d— 4+r I

Field Encodings: rr: 00 for BC, 01 for DE, 11 for HL

y: 0 for IX, 1 for IY

1 2 ... 64 65 66 67 68 69 70 71 72 73 74 ... 267 268

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Zilog Z80380 Bedienungsanleitung Seite 69