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TIME BASE CONTROL LOGIC
,
A2.
The function and time base requirements are applied internally to the COl chip on
six-lines. The inverse states of this code are fed out to the rear Data Output
connector.
As the 9916 is a single function instrument the
-Z;,
b,
~ 'function' lines are held
permanently at logic '1'. The time base information code is g.iven in Table 2.
TABLE
2
Time Base Sel ection Code
Code
Gate Time
Resolution
-
-
-
Channel A
Channel B
x
y
z
~4s
g
1
lCo>
0
1
1
lams
1 kHz
100 Hz
1
0
1
100 ms
100 Hz
la Hz
0
0
1
1s
10Hz
1 Hz
1
1
0
10s
1 Hz
0.1 Hz
DATA OUTPUT FORMAT
A3.
The b.c.d. outp,_'t data is available at the 28-way edge connector
in
a bit
parallel,byte serial form.
The data is sequenced by a la kHz synchronising signal.
The data presentation is delayed
0.5}Js
from the negative edge of the synchronising signal.
An additional synchronising pulse R(o) determines the first state (lOo digit).
Figure
Al
(not drawn to scale) shows the timing sequence for the ten states.
A4.
The ten data output states are as follows:-
States
1
to
8
9
10
9916 Vol. 2 .
Facil ity
Digit (display) i
3
formation.
7
Overflow for 10 , 10 4 ; 10 6 and la
digits on
pins D, Er 4 and 5 respectively.
Decimal point position in kHz units, plus overflow
informati.on for
10 5
digit (relative to directly gated
input) via pin
5.
T
ech. Spec.
(9)
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