Skip to main content
Renesas Electronics America - Knowledgebase

E1203124 or E0204001 error_RL78_E1/E20_CS+

Last Updated:02/14/2018


The RL78 family MCU is being debugged using E1 or E20 in the CS+ environment.

When downloading of programs is started, the following message is displayed and downloading is interrupted.

Download failed
[Direct Error Cause]
Writing to the on-chip debug reserved area is prohibited (address:0x****) (E1203124 or E0204001)


This message is displayed when a user program has been downloaded to the area used by the debugger.

Since "address: 0x****" in this message indicates the address at which the area used by the debugger overlaps that of the user program, the area to which the user program is to be downloaded should be re-examined.

The area used by the debugger can be confirmed from the following:

"E1/E20/E2 Emulator, E2 Emulator Lite Additional Document for User’s Manual (Notes on Connection of RL78) " -> "3.3 Securing of area for debugging"
Suitable Products
CS+ (formerly CubeSuite+)
E1 [R0E000010KCE00]
E20 [R0E000200KCT00]