ISR
ADDRESS
B7F5H
JRDI
07
06
05
04
03
02
01
00
INPUT
DELTA IRxRDYI <
DELTA I
I
PORT
BREAK FFULLB
TxRDYB
CNTR
BREAK I
RxRDYI ITxRDYA
READY
A i
FFULLA I
CHANGE
B i
IBADl
Hl4l
..
1-------------------~
....
,BADD
Hl
BIT VALUES
BIT
1
0
1
BIT 6
0
1
BIT 5
0
1
8fT
4
0
BIT 3
0
BIT 2
0
I
BIT 1
0
I
1
I
BIT 0
0
Figure
C-9
NO
INTERRUPT
INPUT PORT CHANGE
OF
STATE DETECTED
NO
INTERRUPT
CHANGE IN
BREAK STATE DETECTED ,Cf4
B)
NO
INTERRUPT
R,RDY/HULL
CONDITION (CH
BI
NO INTERRUPT
TxRDY
CONDITION ,CH III
NO INTERRUPT
COUNTER
READY CONDITION
NO
INTERRUPT
CHANGE IN BREAK STATE DETECTED ,CH
A)
NO
INTERRUPT
RxRDY/FFULL CONDITION (CH
Ai
NO INTERRUPT
TxRD\'
CONDITION jCH
AI
2681
DUART:
Interrupt
Status
Register
(ISR)
IMR
ADDRESS
87F5H
(WRI
0"
06 05 04
I INPUT I DELTA I I I
I
P~RT
I BRC' K R,RDY; I CNTR
I
< v < < I <
c~
!
HULLS
i
READY
I
CHANGE 8 I I
03
DELTA
BREAK
A
02
01
R,RDYI
I
,.RDYB
FFULLA I
00
T.RDYA
IBAD7
H)
.....
II_-----------------_
...
IBADD HI
I
BIT VALUES
I
BIT
0 INTERRUPT DISABLED
1
INPUT
PORT
CHANGE
OF
STATE INTERRUPT
ENABLED
BIT 6
0 INTERRUPT DISABLED
1
CHANGE IN BREAK STATE INTERRUPT ENABLED
(CH
Bi
5
0
INTERRUPT DISABLED
R,RDY/FFULL INTERRUPT ENABLED ICH
B)
BIT 4
0 INTERRUPT DISABLED
T.RDY
INTERRUPT ENABLED
(CH
B;
BIT 3
0 INTERRUPT DISABLED
I
COUNTER READY INTERRUPT ENABLED
BIT 2
0 INTERRUPT DISABLED
CHANGE
IN
BREAK STATE INTERRUPT ENABLED
iCH.
Ai
BIT 1
0 INTERRUPT DISABLED
R,RDY/FFULL INTERRUPT ENABLED ICH
Ai
BIT 0
0 INTERRUPT DISABLED
1
T,RDY
INTERRUPT ENABLED iCH.
A)
Figure
C-10
2681
DUART:
Interrupt
Mask
Register
(IMR)
C-8
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