Zilog Z80380 Manual de usuario descargar pdf (Pagina 207)

5-173

Z380

™

USER'S MANUAL

ZILOG

DC-8297-03

SUB

SUBTRACT (WORD)

SUB HL,src src = DA

Operation: if (XM) then begin

HL(31-0) ← HL(31-0) - src(31-0)

end

else begin

HL(15-0) ← HL(15-0) - src(15-0)

end

The source operand 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. Note that the length of the operand is controlled by the Extended/Native mode

selection, which is consistent with the manipulation of an address by the instruction.

Flags: S: Unaffected

Z: Unaffected

H: Set if there is a borrow from bit 12 of the result; cleared otherwise

V: Unaffected

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

DA: SUB HL,(nn) 11101101 11010110 -n(low)- -n(high) 2+r I, X

1 2 ... 202 203 204 205 206 207 208 209 210 211 212 ... 267 268

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Zilog Z80380 Manual de usuario Pagina 207