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ZiLOG Z8 Technical Manual

ZiLOG Z8
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DI
Instruction
for.at:
OPC
Operation:
flags:
EX8lllple:
IMR
(7) <-- 0
01
Disable Interrupts
OPC
Cycles (Hex)
6
8F
Bit
7
of
control
register
251
(the
Interrupt
Mask
Register)
is
reset
to
O.
All
interrupts
are
disabled,
although
they
remain
potentially
enabled
(i.e.,
the
Global
Interrupt
Enable
is
cleared--not
the
individual
interrupt
level
enables.)
No
flags
affected
If
control
register
251
contains
%8A
(10001010,
that
is,
interrupts
IRQ1
and
IRQ3
are
enabled),
the
statement
DI
sets
control
register
251
to
%OA
and
disables
these
interrupts.
5-19

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ZiLOG Z8 Specifications

General IconGeneral
BrandZiLOG
ModelZ8
CategoryDesktop
LanguageEnglish

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