C-SPY can connect to an E1, E2, E20, or E2 Lite/EZ-CUBE2 emulator using a C-SPY hardware debugger driver as an interface. The C-SPY hardware debugger drivers are automatically installed during the installation of IAR Embedded Workbench.

All RX microcontrollers have built-in, on-chip debug support. Because the hardware debugger logic is built into the microcontroller, no ordinary ROM-monitor program or extra specific hardware is needed to make the debugging work.