HP 5335A - Page 70

IViOUtJi
Operation and Programming
EXAMPLE 11. SERVICE REQUEST and WAIT
The following program serves as an example of the SRQ (Service Request) feature in the 5335A.
As the controller is executing each program line, it logs in the interrupt request and assigns it a
priority; the 9825A will finish the current line and then branch to the service routine (End of Line
branching — EOL). Once the service routine is completed (by executing its “iret” statement), the
main program pointer will return to the following line from where the interrupt occurred. Line 1
sets up the 5335A into the WAIT mode and enables the sending of SRQ at the end of a
measurement; line 2 specifies where to go when the 9825A receives.a SRQ, and line 3 enables the
use of SRQ. Line 4 simply loops, doing nothing. Lines 5 through 8 are executed whenever an SRQ
from the counter is received, a measurement data is then read and the counter is reset.
9825A EXAMPLE
0: din a* c a n
1: wrt 7 03, "wat >sri *'
2: on x 7 ; . "SRQ”
3: e :i. r 7
4: at o 3
S: "SRQ “ s
6: if bit<6 > r d s < 7 0 3 ) )
red 703,AT
8= dsp AT
9: wrt 703>“re"
1 0 : i r e t
1 i s eitd
*2714
9835A EXAMPLE
i 0
DIM ATI!21!!
20
OUTPUT 703;“wat, sr i"
3 0
ON I NT #7 GQ81JB Srq
! ENABLE
40
CONTROL. MASK 7; 128
! SET Uf
SO
CARD ENAB1..E 7
! ENABLE
Si
WAIT 100
6 0
GOTO 40
70 Sr q
; 1
8 0
STATUS 703;Te«p
90
IF NOT BIT (Tewp ,6) TH
EN 100
i no
ENTER 703; AT
iiO DISP AT
120
OUTPUT 703;"re"
121
WAIT 100
130
RETURN
140
END
END ™ Q F “ “L I HE BRANCHES
INTERRUPT CONDITION.
CARD FOR INTERRUPTS.
3-54
i. A _ t - I f'IIP )