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A d d r e s s
0 2F8
0 2 F 8
0 2F9
0 2F9
D e s c r i p t i o n
R e a d R e c e i v e r B u f f e r R e g i s t e r ( C h a r a c t e r R e c e i v e d )
B i t
D e s c r i p t i o n
0
B i t 0
-
LSB ( F i r s t B i t R e c e i v e d S e r i a l l y )
1
B i t 1
2
B i t 2
3
B i t
3
4
B i t
4
5
B i t
5
6
B i t
6
7
B i t
7
-
MSB
D i v i s o r L a t c h LSB ( D i v i s o r L a t c h A c c e s s B i t DLAB
="1")
B i t
D e s c r i p t i o n
0
B i t 0
1
B i t 1
2
B i t 2
3
B i t 3
4
B i t
4
5
B i t
5
6
B i t
6
7
B i t
7
D i v i s o r L a t c h MSB ( D i v i s o r L a t c h A c c e s s B i t DLAB
="l")
B i t
D e s c r i p t i o n
0
B i t 0
1
B i t 1
2
B i t 2
3
B i t
3
4
B i t
4
5
B i t
5
6
B i t
6
7
B i t
7
I n t e r r u p t
E n a b l e R e g i s t e r
B i t
D e s c r i p t i o n
0
"1"
= E n a b l e s t h e R e c e i v e d D a t a A v a i l a b l e
1
I1
1
I1
= E n a b l e s t h e T r a n s m i t t e r H o l d i n g R e g i s t e r
I n t
2
"1" = E n a b l e s R e c e i v e L i n e
S t a t u s I n t e r r u p t
3
"1" = E n a b l e s t h e Modem
S t a t u s I n t e r r u p t
4-7
A l w a y s L o q i c a l 11011
I n t e r r u p t
4 3
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