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SILICON GATE MOS
8251
READ
AND
WRITE
TIMING
CID,CS.
..,1'----------------""1"---------"1'--
D
7
-D
O
-----..--'I~
~--
t
DS
-------1~
..
--
*WRITE
------J---..:.-/'..---
twR
1
""-'-----...,t.......---
·WRITE AND READ
PULSES
HAVE
NO
TIMING LIMITATIONWITH
RESPECT
TO
ClK.
TRANSMITTER
CLOCK
AND
DATA
TxC(1xBAUDI
TxC
(16x BAUD)
4IlI
--~~f
TxD
__
I
J;:-
16
TxC
PERIODS-------::;C
_
___
x---
RECEIVER
CLOCK
AND
DATA
RXD=..:..t_-tsRX---f:l:--tHRX--~
- - -
--
RxC
(1x BAUD)
~'-____________
\
INTERNAL
SAMPLING n
PULSE
10-
_
RXD~----STARTBIT----:r
__
~st~A~A:T_
-.:-3l=-
-
--
14111---
t
SRX
~4IlI----
t
HRX
~
RiC (16x BAUD)
INTERNAL
~~~~ING
---.1
~
~
_
Tx
RDY
AND
Rx
RDY
TIMING
(ASYNC MODE)
RxD
---,
START BIT I DATA
BITS
tRX
q
RXRDY___________
__
READ
WRITE
WRITE 1st BYTE WRITE 2nd BYTE
TxD
MA'R'i<'i'NGJ
START BIT
-I
--D-A-TA-BI-T-l~l\-----...------+--~~~~
I.
1st
DATABYTe
--------.-1
Tx RDY
Tx
EMPTY
INTERNAL
SYNC
DETECT
1
......
,----------
SYNC
CHARACTER (01101001) ---------1·.-11
RxD-----I 1st BIT 1 1
~AST
BIT
,----1-
RESET
BY
SYNDET
tiS
~/
SOFTWARE
(OUTPUT)--------------------------~
COMMAND
EXTERNAL
SYNC
DETECT
n
RxC
---,~
...
1~
~~I00...-
__
"""'"
-
-----1F
tES
SYNDET -
(INPUT)
~D:==:==::::==~I~~~~~~~~~~~~~~~~I
1
14
.,...-------
1st
DATA
BYTE
------
••
1
1
5-146