Interrupt Operation Command Words - NEC Advanced Personal Computer System Reference Manual

OCWI
D7
OCW2
DO
INTERRUPT MASK
I: MASK SET
0: MASK RESET
MO TO M7 CORRESPOND TO IRO TO IR7
D7 DO
I
R
I
SL
I
EO!
I
0
I
0
I
L21
Lli
LO
I
OCW3
D7
f
IR LEVEL
L2 Ll
LO MASTER
0 0 0 IRO
0 0 1 IRI
0 0 IR2
0 I IR3
0 0 IR4
0 IRS
0 IR6
NONSPECIFIC EO! COMMAND
SPECIFIC EO! COMMAND
SLAVE
IR7
IR8
IR9
IRIO
IRll
IR12
IRI3
IRI4
ROTATE ON NONSPECIFIC EO! COMMAND
ROTATE IN AUTOMATIC EO! MODE (SET)
ROTATE IN AUTOMATIC EO! MODE (CLEAR)
ROTATE ON SPECIFIC EO! COMMAND
SET PRIORITY COMMAND
NO OPERATION
DO
RR RIS
o
READ IRR
READISR
I: POLL COMMAND
0: NO POLL COMMAND
ESMM SMM
o
RESET SPECIAL MASK
SET SPECIAL MASK
Figure 2-16 Interrupt Operation Command Words
Processor PCB
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