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STI
SET INTERRUPT·
ENABLE FLAG
STI
Operation:
(IF)
-1
Flags Affected:
Description:
STi (Set Interrupt-enable flag) sets IF to
1,
enabling processor recognition of maskable
interrupt requests appearing on the INTR line.
Note however, that a pending interrupt
will
not actually be recognized until the instruction
following STI has executed. STI does not
affect any other flags.
Encoding:
11111011
STI Operands
Clocks Transfers
(no operands)
'2
-
2-154
IF
Bytes
STI Coding Example
1 STI