Samsung S3C2440A - Manual (Page 306)

UART S3C2440A RISC MICROPROCESSOR
11-2
BLOCK DIAGRAM
B u a d - r a t e
G e n e r a t o r
C o n tr o l
U n it
T r a n s m it t e r
R e c e i v e r
P e r ip h e r a l B U S
T X D n
C lo c k S o u r c e
( P C L K , F C L K / n ,U E X T C L K )
R X D n
T r a n s m it F IF O R e g is te r
( F IF O m o d e )
T r a n s m it H o ld in g R e g is te r
( N o n - F I F O m o d e )
R e c e iv e F I F O R e g is te r
( F IF O m o d e )
R e c e iv e H o ld in g R e g is te r
( N o n - F IF O m o d e o n ly )
I n F IF O m o d e , a ll 6 4 B y te o f B u ffe r r e g is te r a r e u s e d a s F IF O r e g is t e r .
I n n o n - F IF O m o d e , o n ly 1 B y te o f B u ff e r r e g is te r is u s e d a s H o ld in g r e g is te r .
T r a n s m it S h ifte r
T r a n s m it B u ff e r
R e g is te r ( 6 4 B y te )
R e c e iv e S h ifte r
R e c e iv e B u f fe r
R e g is t e r ( 6 4 B y t e )
Figure 11-1 UART Block Diagram (with FIFO)