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Sharp CE-158 Service Manual page 13

Rs-232c interface (pc-1500 option)
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PC-1500
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TRA NSMITTER
HOt.
OING..
TRAN$M1r
r
£H
$tUFT
.,.:
REGISTER LOAOEO
REGISTER
LDADED
T
CLO(;K
WNI
T
EI
tTPB!
I
l T
,
,
.........,.:
trru
:.....;
:-1c1t-1
~
.
T...,E
_ _ _ _
_,
soo
-:
~
tc
o
I'
'
DAT
A.
SIT
THE
BOLDING REGISTER IS
LOADED
ON THE TRAillNG EDGE
OFTPB
••
THE TRANSMl1TER SHIFT REGISTER
IS
LOADED ON
Till\
FIRST HIGH-TO.LOW lRt\!'ISITION
OF
Tf!
E
CLOCK WHICH
OCCURS
AT
LEAST
I
/2
CLOCK PERIOD
+
lTC AFTER THE TRAIUNG
EOGE
OFTPB,
ANO TRANSMISSION
OF
A START BIT OCCURS 1/2 CLOCK PERIOD +tep
LATER.
WRITE
IS TllE
OVEl!LAP OF
TPB,
CSI
,
AND CS3
=I
AND
CS3.
Rll/
WR
0.
Fig.
I
-
Transmiller
liming
diagram
-
MODE
I.
1501'1'
;-.-err·~
TP~---------------:;:,.,~
:---•Rsw
75ni
:
;...1was
...
t1\
-----------~~----t•>-+----~·--~·~--
11SEL
i
~
X~--
_
-;!
' .
:
1
125n111
:-•Dv1~
:--
w o::t,
,
___ _
T
S
US:
0-
f
SUS
7
------------"-----II,__ _
_
__
_._
__
./\..
__
_
11
WRIT!>
IS
THE
OVERLAP
OF TPB.
C:SJ,
CS3
=I
AND CS2. RO/WR
O.
Fig.
2
-
MODE
I
cpu
inte.rface
(WRITE)
timing
diagram
.
Do not
sale
this PDF!!!
11

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