Intel 81342 Developer's Manual page 905

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U A R T s — I n t e l 8 1 3 4 1 a n d 8 1 3 4 2
1 5 . 4 . 1 0 D i v i s o r L a t c h R e g i s t e r s
T h e d e s c r i p t i o n o f u s e f o r t h e D i v i s o r L a t c h R e g i s t e r s a r e p r o v i d e d i n
A u t o - B a u d - R a t e D e t e c t i o n
t h o s e s e c t i o n s f o r d e t a i l s o n h o w t o p r o g r a m t h e s e r e g i s t e r s .
B i t D L A B i n t h e L C R r e g i s t e r m u s t b e s e t h i g h b e f o r e t h e D i v i s o r L a t c h r e g i s t e r s c a n b e
a c c e s s e d .
A D i v i s o r v a l u e o f 0 i n t h e D i v i s o r L a t c h R e g i s t e r i s n o t a l l o w e d . A v a l u e o f 0 h a s t h e
a f f e c t o f d i s a b l i n g t h e U A R T . T h e r e s e t v a l u e o f t h e d i v i s o r i s 0 2 .
T a b l e 5 7 6 . U A R T x D i v i s o r L a t c h L o w R e g i s t e r - ( U x D L L )
s
3 1
t e
P
b u
r v
I O r i
t t
A
e s
u t
I
P C i b n a
t r
A t
U n i t #
0
1
B i t
31:8
7:0
T a b l e 5 7 7 . U A R T x D i v i s o r L a t c h H i g h R e g i s t e r - ( U x D L H )
s
3 1
t e
P
b u
r v
I O r i
t t
A
s
t e
I
b u
P C n a
r i
t t
A
U n i t #
0
1
B i t
31:8
7:0
D e c e m b e r 2 0 0 7
O r d e r N u m b e r : 3 1 5 0 3 7 - 0 0 2 U S
a n d S e c t i o n 1 5 . 3 . 6 , M a n u a l B a u d R a t e S e l e c t i o n
2 8 2 4
r v r v r v r v r v r v r v r v r v r v
n a n a n a n a n a n a n a n a n a n a
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I n t e l X S c a l e C o r e i n t e r n a l b u s a d d r e s s
+ 2 3 0 0 H ( D L A B = 1 )
+ 2 3 4 0 H ( D L A B = 1 )
D e f a u l t
00 0000h Reserved
02h Low byte compare value to generate baud rate
2 8 2 4
r v r v r v r v r v r v r v r v r v r v
n a n a n a n a n a n a n a n a n a n a
®
I n t e l X S c a l e C o r e i n t e r n a l b u s a d d r e s s
+ 2 3 0 4 H ( D L A B = 1 )
+ 2 3 4 4 H ( D L A B = 1 )
D e f a u l t
00 0000h Reserved
00h High byte compare value to generate baud rate
2 0 1 6 1 2
r v r v r v r v r v r v r v r v r v r v
n a n a n a n a n a n a n a n a n a n a
A t t r i b u t e L e g e n d :
R V = R e s e r v e d
P R = P r e s e r v e d
R S = R e a d / S e t
D e s c r i p t i o n
2 0 1 6 1 2
r v r v r v r v r v r v r v r v r v r v
n a n a n a n a n a n a n a n a n a n a
A t t r i b u t e L e g e n d :
R V = R e s e r v e d
P R = P r e s e r v e d
R S = R e a d / S e t
D e s c r i p t i o n
I n t e l
S e c t i o n 1 5 . 3 . 5 ,
. R e f e r t o
8 4
r v r v r v r w r w r w r w r w r w r w
n a n a n a n a n a n a n a n a n a n a
R W = R e a d / W r i t e
R C = R e a d C l e a r
R O = R e a d O n l y
N A = N o t A c c e s s i b l e
8 4
r v r v r v r w r w r w r w r w r w r w
n a n a n a n a n a n a n a n a n a n a
R W = R e a d / W r i t e
R C = R e a d C l e a r
R O = R e a d O n l y
N A = N o t A c c e s s i b l e
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8 1 3 4 1 a n d 8 1 3 4 2 I / O P r o c e s s o r s
D e v e l o p e r ' s M a n u a l
0
r w
n a
0
r w
n a
9 0 5