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COUNTER
ASSEMBLY
4.
105
In
the
CDI
Chip
the
data
stores
feed
in
parallel into
a
common
b.c.d.
four-line
output.
The
store
outputs are
enabled
in
turn
for
approximately lOOps by
a
10kHz
reference
signal,
derived from
the
10MHz
reference frequency.
4.
106
The b.c.d.
data
is
fed
to
a
7-segment decoder
(IC12)
which
offers
the
decoded
data
to
the
bank
of
LED
digital indicators.
The
10kHz
reference
is
fed via a
presettable
decade
counter
IC4
to
a
BCD
to
Decimal decoder
IC3
which
enables
each
display
LED
in
turn for
lOOps.
A
reset
pulse
(Ro)
ensures that the display data
is
synchronised with
the data
store
readout.
The
function of the presettable
decade
counter
IC4
is
described
in
the next
paragraph
.
SHIFT
DATA
TRAILING
DIGIT
BLANKING
I
I
-
'
Multiplex Display
System
Fig.
4
2
9081
&
9082 Vol
.
2
4-19
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