Zilog Z80380 Manual do Utilizador descarregar pdf (Página 59)

100

101

5-25

Z380

™

USER'S MANUAL

ZILOG

DC-8297-03

ADD

ADD TO STACK POINTER (WORD)

ADD SP,srcsrc = IM

Operation: if (XM) then begin

SP(31-0) ← SP(31-0) + src(31-0)

end

else begin

SP(15-0) ← SP(15-0) + src(15-0)

end

The source operand is added to the SP register and the sum is stored in the SP register. This

has the effect of allocating or allocating space on the stack. Two’s complement addition is

performed.

Flags: S: Unaffected

Z: Unaffected

H: Set if there is a carry from bit 11 of the result; cleared otherwise

V: Unaffected

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

IM: ADD SP,nn 11101101 10000010 -n(low)- -n(high) 2 I, X

1 2 ... 54 55 56 57 58 59 60 61 62 63 64 ... 267 268

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Zilog Z80380 Manual do Utilizador Página 59

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