
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
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