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KAB02- O
!
KAB03- O
i>—\
p—
p
KAB04-
O
<
—
j
P~'f
P~~
KAB06-
O
'»
KOTAL-
O-
KINAl-
O
KSKSL-
O
KSMKL-
O-
KSTRB- O
If
-
-K>r^>"-
INPUT
DATA
REGISTER
(UP
TO
12
BITS)
OUTPUT
DATA
REGISTER
(UP TO
12
BITS)
OTA
15
LOAD
REGISTER
-ALWAYS READY
INA15
INPUT REGISTER
IF
NEW DATA
SKS15
SKIP
IF
NOT
INTERRUPTING
OCR
15
ACKNOWLEDGE
INTERRUPT
SMK
BIT 3
SET/RESET
MASK
CPU
CAN OUTPUT TO
DEVICE VIA REGISTER WITH
OTA
COMMAND.DEVICE CAN
INPUT
DATA
TO
CPU
VIA
REGISTER WITH
INA
COMMAND.
INTERRUPT
OCCURS ON ARRIVAL
OF
NEW DATA
(IF
MASKED
ON).
Figure
2-18.
Programmed
l/O
Interface
with an
External Device
2-23
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