WATCH WINDOW

This window has two purposes

• It behaves as a data labels lookup, allowing quick symbolic reference to user defined assembly variables (general purpose registers)
• It allows data watch points to be set

Selecting a label multple times causes cycling between three different types of watch point and no watch point at all. The three categories are:
• modified - any access (read or write) of the register
• changed -  only accesses that cause a change in the contents of the register
• write - any attempt to write to the register

Watch points are similar to break points. They cause the simulator to trap accesses to data locations. Say for instance you had a data location that was occationally being set to an unexpected value. You could either trace your code step by step until you found the reason for the change or you could set a watch point on the data location and inspect the code when the simulator traps the access to the data location.