D.2 Mode A Waveforms

Software-Triggered Strobe with No Hardware Gating

Mode A is one of the simplest operating modes. The counter will be available for counting source edges when it is issued an ARM command. On each TC the counter will reload from the Load register and automati- cally disarm itself, inhibiting further counting. Counting will resume when a new ARM command is issued.

SOURCE

WR

 

ARM

 

 

 

 

 

 

 

 

 

 

COMMAND

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

COUNT

X

L

L-1

L-2

K+1

K

K-1

2

1

0

L

VALUE

 

 

 

 

 

 

 

 

 

 

 

TC OUTPUT

TC TOGGLED

OUTPUT

Mode A Waveforms

47

AppendixD

Page 55
Image 55
Advantech PCM-3780 manual Mode a Waveforms, Software-Triggered Strobe with No Hardware Gating