E1/E20/E2/E2 Lite Additional Document 2. Designing the User System
R20UT2937EJ0301 Rev.3.01 Page 29 of 45
Jul 1, 2020
2.7 Notes on Designing the User System
2.7.1 Isolator for the E1
For a debugging environment where there is a difference in potential between the GND of the user
system and that of the host PC, use the isolator for the E1 emulator (R0E000010ACB20) which is
separately available from Renesas.
That is, use the isolator for the E1 (R0E000010ACB20) with the E2/E2 Lite in such situations.
2.7.2 Low-Voltage OCD Board
Since the RL78-S1 core device needs 4.5 V to 5.5 V as the voltage for rewriting flash memory, if the
voltage is less than 4.5 V, the debugging functions that require flash memory to be rewritten (e.g.,
program download) cannot be operated. When debugging with a voltage less than 4.5 V, the low-
voltage OCD board (R0E510Y47LVB00 or R0E510Y16LVB00) which is sold separately must be
prepared. For details on the low-voltage OCD board, refer to the user's manual.
When the low-voltage OCD board is in use, none of the extended functions supported by the E2
emulator are available.
The low-voltage OCD board cannot be used for RL78/G1M and RL78/G1N.
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