Zilog Z80380 Manual do Utilizador descarregar pdf (Página 141)

5-107

Z380

™

USER'S MANUAL

ZILOG

DC-8297-03

MULTUW

MULTIPLY UNSIGNED (WORD)

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

Operation: HL(31-0) ← HL(15-0) x src(15-0)

The contents of the HL register are multiplied by the source operand and the product is

stored in the HL register. The contents of the source are unaffected. Both operands are

treated as unsigned, binary integers.

The initial contents of the HL register are overwritten by the result. The Carry flag is set to

indicate that the upper word of the HL register is required to represent the result; if the Carry

flag is cleared, the product can be correctly represented in 16 bits and the upper word of

the HL register merely holds zero.

Flags: S: Cleared

Z: Set if the result is zero; cleared otherwise

H: Unaffected

V: Cleared

N: Unaffected

C: Set if the product is greater than or equal to 65536; cleared otherwise

Addressing Execute

Mode Syntax Instruction Format Time Note

R: MULTUW [HL,]R 11101101 11001011 100110rr 11

RX: MULTUW [HL,]RX 11101101 11001011 1001110y 11

IM: MULTUW [HL,]nn 11101101 11001011 10011111 -n(low)- -n(high) 11

X: MULTUW [HL,](XY+d) 11y11101 11001011 ——d— 10011010 13+r I

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

y: 0 for IX, 1 for IY

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