4.18.1.2 IDR Events

When the application program writes a byte of data to the OCDR register of an AVR device while being debugged, the debugger reads this value out and displays it as IDR events in the output window, as shown in the figure below. The OCDR register is polled at a given interval, so writing to it at a higher frequency than the one specified for the debugger will not yield reliable results. The device data sheet will explain how to check that a given value has been read.

Figure 4-9. IDR Events
Note: The Output window does not have the IDR Messages drop-down if no IDR events have been sent from the debugger.