Zilog Z80380 Bedienungsanleitung PDF herunterladen (Seite 168)

5-134

Z380

™

USER'S MANUAL

DC-8297-03

ZILOG

PUSH

PUSH ACCUMULATOR

PUSH src src = AF

Operation: if (LW) then begin

SP ← SP - 4

(SP) ← F

(SP+1) ← A

(SP+2) ← 00h

(SP+3) ← 00h

end

else begin

SP ← SP - 2

(SP) ← F

(SP+1) ← A

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. For this instruction, the Flag register is the least

significant byte, followed by the Accumulator. The other two bytes written in the Long Word

mode are all zeros. The Flag register and Accumulator are unaffected.

Flags: S: Unaffected

Z: Unaffected

H: Unaffected

V: Unaffected

N: Unaffected

C: Unaffected

Addressing Execute

Mode Syntax Instruction Format Time Note

PUSH AF 11110101 3+w L

1 2 ... 163 164 165 166 167 168 169 170 171 172 173 ... 267 268

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Zilog Z80380 Bedienungsanleitung Seite 168