Toshiba nv Series - Application as a Gate on Timer with Alarm

Chapter 3 Counter function of the PI918
6F8C1370
16
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3.1.3. Application as a gate on timer with alarm
Thepulsewidth(ONTIME)ofthesignalappliedtothegateinputis
measuredusinginternalreferencepulses.  Apulsewidthoveracertain
periodcanbedetectedbasedonachangeintheinterruptstatusby
settinganalarmvalue.
Condition：
Parameter
setting
EP AL SP SV
0 1 0 0
External
input
Pulseinput Gateinput
Notrequired
Connectionofpulsestobe
measured.  Gatebatch
permissionsettingisnot
available.(GEN=‘0’)

Operation：
(1) Theonpulsewidthofthegateinputismeasured.  Aninversionof
theinterruptstatusbitoccurswhenthecountreachesthealarm
value.  Foralarmvaluesof8001htoFFFFh,nointerruptcondition
occurs.  Foranalarmvalueof8000h(32768),aninterruptoccurs
at"0"count.
(2) Thecountervalueistransferredtotheholdregisterwhenthegate
inputconditionincludingcommandchangesfromONtoOFF.
Figure 3.1.3. Example of gate on timer with alarm operation
Gateinput
(Measuredpulse)
Internal
referencepulse
Countvalue
Alarmvalue(1to32768)
Interruptstatus
Command

Holdvalue
A
B
C
A
B
C
t
A
t
B
t
C

ONONON
0
0
(32767)
Gatepulsewidthtx=Holdvalue
÷
 Internalreferencepulse(Hz)
(Inversion)