Block that outputs how often the trigger input
changed to true since the last invocation of
reset.
This block may be used as a counter. Its output y
starts at the parameter value y_start. Whenever the
input signal trigger changes to true, the
output is incremented by 1. When the input
reset changes to true, then the output is
reset to y = y_start. If both inputs
trigger and reset change simultaneously,
then the ouput is y = y_start.
visible attribute in icon.