I'm having trouble while trying to debug the RL78G13 when the VCC applied to it is below 3.5V but I haven't seen anything in the documentation related to that.
Note that when I want to program the MCU using Renesas Flash Programming Tool (RFP) I can do it without any problem.
I'm using the E1 emulator with external power supply at 3.3V and e2 Studio 2021-04 (21.4.0).
The error I'm getting is:
The hardware I have is:
Hi Albert, I see in your schematic that C11 is specified between 47pF and 1uF.
According to the hardware usermanual this should be between 470nF and 1uF.
If you are using anything less than 470nF this could explain the behaviour you are seeing as this is the internal regulators stabilisation capacitance.