Set Interrupt Enable Flag
|
86/88 |
Y |
186 |
Y |
286 |
Y |
386 |
Y |
486 |
Y |
STI |
|
Ovfl |
N |
Dir |
N |
Int |
1 |
Trap |
N |
Sign |
N |
Zero |
N |
Aux |
N |
Prty |
N |
Carry |
N |
STI sets the Interrupt Enable Flag, permitting the processor to
recognize maskable interrupts. No other flags are affected. (Non-
maskable interrupts are recognized no matter what the state of the
interrupt enable flag.)
Note: A pending interrupt will not be recognized until
after the instruction following the STI executes.
------------------------------------ Timing ----------------------------------
OpCode Instruction 386 286 86
FB STI 3 2 2
------------------------------------ Logic -----------------------------------
IF = 1
See Also CLI STC CLC CMC STD CLD Flags |