Data Sheet

LABCENTER ELECTRONICS LTD.
208
Now select the graph icon and then the digital graph from the parts bin. Left click the mouse at
the top left of where you want the graph to be and then move the mouse down and to the right.
Left click again to commit placement.
Note that the graph on the schematic doesn't need to be particularly large. We will
maximise it later when we want to analyse the simulation results.
Having added the graph we now need to tell it which wires we want to trace. We do this by
attaching probes to the wires and then specifying the probes as traces on the graph. Select the
voltage probe icon and then place a probe on each of the two I2C lines. This is done exactly as
we discussed earlier in the section on hardware breakpoints.