Zilog Z80380 Bedienungsanleitung PDF herunterladen (Seite 80)

5-46

Z380

™

USER'S MANUAL

DC-8297-03

ZILOG

DISABLE INTERRUPTS

DI [n]

Operation: if (n is present) then begin

for i=1 to 4 begin

if (n(i) = 1) then begin

IER(i-1) ← 0

end

if (n(0) = 1) then begin

SR(5) ← 0

end

else begin

SR(5) ← 0

end

If an argument is present, disable the selected interrupts by clearing the appropriate enable

bits in the Interrupt Enable Register, and then clear the Interrupt Enable Flag (IEF1) in the

Select Register (SR) if the least-significant bit of the argument is set, disabling maskable

interrupts. Bits 7-5 of the argument are ignored.

If no argument is present, IEF1 in the SR is set to 0, disabling maskable interrupts.

Note that during execution of this instruction the maskable interrupts are not sampled.

Flags: S: Unaffected

Z: Unaffected

H: Unaffected

V: Unaffected

N: Unaffected

C: Unaffected

Addressing Execute

Mode Syntax Instruction Format Time Note

DI 11110011 2

DI n 11011101 11110011 —n—— 2

1 2 ... 75 76 77 78 79 80 81 82 83 84 85 ... 267 268

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Zilog Z80380 Bedienungsanleitung Seite 80