p><p>If the trigger event <i>e</i> is null and there was no previously set trigger event, then the monitoring is not started.&nbsp; Monitoring can be started by explicitly calling <a href="#uvm_heartbeat.start" class=LMethod id=link11 onMouseOver="ShowTip(event, 'tt6', 'link11')" onMouseOut="HideTip('tt6')">start</a>.</p></div></div></div>




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<div class="CMethod"><div class=CTopic><h3 class=CTitle><a name="uvm_heartbeat.add" href="../../src/base/uvm_heartbeat.svh">add</a></h3>
    