The E20 debugger is a sophisticated, high end, on-chip debugging emulator for the Renesas RH850 Family, V850 Family, RX Family, RL78 Family, R8C Family, and 78K Family of microcontrollers.
In addition to the debugging functions supported by E1, the E20 provides enhanced trace functions, real-time RAM monitor functions and other functions as well. The E20 can be used as a flash programmer.
Please note: The large trace and real-time RAM monitor functions, the specific features of E20 are not available with some MCUs. For using them, the target MCU must be equipped with a pin for outputting trace information. Such MCUs are currently included only in the MCU packages that have more than 100 pins in the RX600 or RX700 series (As of February 2015). As for the other MCUs, the supported function by E20 corresponds to that of E1 Emulator.
Full product information on the E20 is available here.