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Example
1. Data Ready SRO
Data Ready
is a feature of the 3468A
that allows it to interrupt the controller
after each
completed
measurement
(data ready).
This means
that the controller
doesn't
waste
valuable
computing
time waiting for measurement
data
but pro-
ceeds
with
its work
until interrupted.
To enable the data ready feature
on the
3468A, bit O on the SRO mask must be set. Remember that bit O will be true in
the status register anytime data is ready but for the SRO to occur the mask must
be set. The bit pattern for the mask would look like:
bit#:
5
4
3
2
1 +40
value:
O
O
O
O
O
1
Ne"
Neen"
0
't
01 is the octal representation
{see also Figure 4-4)
Consequently,
we would use the command:
OUTPUT
901;"M0O1"
to set the mask
for Data Ready. Therefore,
whenever the 3468A
has data ready it will interrupt
the controller via the SRQ. The controller will only be interrupted if bit O is true,
How
would this look in a simple -hp- Model 85 program?
Line
Description
|
40
Puts the interface into the remote mode.
|
50
Outputs the SRO mask.
ue , ora
See eaten
60
Instructs the computer where to go (line
3h
| 346SA
AT
ADDRESS
9a
jeool when an interrupt (SRO) occurs on
&
RE
oo Bae NE Sana cher
70
ENABLE INTRQ;8 actually enables the -hp-
octal code "8"
in the -hp- Model 85 con-
YB
ENABLE
INT
3
+
bit 6, if it was set, of the status register.
1010-1030
Line 1010 reads the data and resets bit 0
of the status register. Line
1020
displays
the data. Line 1030
returns program
con-
trol to where the program was interrupted.
73
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