AVR devices feature various programming and debugging interfaces. Check the device datasheet for supported interfaces of that device.
The MPLAB ICE 4 ICSP Adapter Board may be used with additional AVR 10-pin or 6-pin JTAG plugin boards for legacy target connections. Snap off the plugin board needed (see figure below) and plug into the adapter board 8-pin SIL connector.
Figure 1. AVR JTAG Plugin Boards
