Zilog Z80380 Manual do Utilizador descarregar pdf (Página 171)

5-137

Z380

™

USER'S MANUAL

ZILOG

DC-8297-03

PUSH

PUSH REGISTER

PUSH src src = R, RX

Operation: if (LW) then begin

SP ← SP - 4

(SP) ← src(7-0)

(SP+1) ← src(15-8)

(SP+2) ← src(23-16)

(SP+3) ← src(31-24)

end

else begin

SP ← SP - 2

(SP) ← src(7-0)

(SP+1) ← src(15-8)

end

The Stack Pointer (SP) is decremented by two (by four in Long Word mode) and the source

is loaded into the memory locations addressed by the SP in ascending byte order in

ascending address memory locations. The contents of the source are unaffected.

Flags: S: Unaffected

Z: Unaffected

H: Unaffected

V: Unaffected

N: Unaffected

C: Unaffected

Addressing Execute

Mode Syntax Instruction Format Time Note

R: PUSH R 11rr0101 3+w L

RX: PUSH RX 11y11101 11100101 3+w L

Field Encodings: rr: 00 for BC, 01 for DE, 10 for HL

y: 0 for IX, 1 for IY

1 2 ... 166 167 168 169 170 171 172 173 174 175 176 ... 267 268

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Zilog Z80380 Manual do Utilizador Página 171