Intel 81342 Developer's Manual page 912

1 6 . 2 . 1 O p e r a t i o n a l B l o c k s
2
T h e I C B u s I n t e r f a c e U n i t i s a s l a v e p e r i p h e r a l d e v i c e t h a t i s c o n n e c t e d t o t h e i n t e r n a l
b u s . T h e 8 1 3 4 1 a n d 8 1 3 4 2 i n t e r r u p t m e c h a n i s m c a n b e u s e d f o r n o t i f y i n g t h e 8 1 3 4 1
a n d 8 1 3 4 2 t h a t t h e r e i s a c t i v i t y o n t h e I
i n t e r r u p t s , a l t h o u g h i t w o u l d b e v e r y c u m b e r s o m e .
o f t h e I 2 C B u s I n t e r f a c e U n i t a n d i t s i n t e r f a c e t o t h e i n t e r n a l b u s .
T h e I 2 C B u s I n t e r f a c e U n i t c o n s i s t s o f t h e t w o w i r e i n t e r f a c e t o t h e I
b u f f e r f o r p a s s i n g d a t a t o a n d f r o m t h e 8 1 3 4 1 a n d 8 1 3 4 2 , a s e t o f c o n t r o l a n d s t a t u s
r e g i s t e r s , a n d a s h i f t r e g i s t e r f o r p a r a l l e l / s e r i a l c o n v e r s i o n s .
2
F i g u r e 1 4 1 . I C B u s I n t e r f a c e U n i t B l o c k D i a g r a m
SINT
®
I n t e l 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
9 1 2
SDA
SCL
2
I C Bus
2
Monitor
I
2
I
SCL
Generator
®
I n t e l 8 1 3 4 1 a n d 8 1 3 4 2 — I
2
C b u s . P o l l i n g c a n b e a l s o b e u s e d i n s t e a d o f
F i g u r e 1 4 1
Serial Shift Register
C Data Buffer Register (IDBR)
2
I C Control Register (ICR)
2
I C Status Register (ISR)
C Slave Address Register (ISAR)
Internal Bus Interface
Internal Bus Address & Control Signals
Internal Bus
2
C B u s I n t e r f a c e U n i t s
s h o w s a b l o c k d i a g r a m
2 C b u s , a n 8 - b i t
Address
Decode
A8280-01
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