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:
What is your LVD setting in the option bytes?
LVD is off (0xFF)...
I am assuming that the exact same setup works at 3.5V and above while it does not work at 3.3V, I have never had any problem running at lower voltages.
Do you know if your application is running on the MCU at the lower voltages? Perhaps toggling a port pin at regular intervals to show application progress would be good.
Have you run the self-check on your E1? Have you tried another debugger?
Hi JB, thanks for your answer!
I've tried what you've told me (toogle port pin, E1 Self-Check) and everything seems all right.
I can debug using a 5V voltage regulator, then I change it to a 3.3V and I cannot. I can also debug using 5V but not 3.3V E1 power supply.
Despite that fact, I can program the microcontroller using RFP V3.08.02 using the 3.3V E1 power supply.
Is there any kind of configuration that must be enabled? Maybe LVD shoud have a concrete value?
If the LVD is disabled the only limitation is the POC level which is very low. Aside from inspecting and comparing signals on a scope of working vs. non-working I don't what else to suggest.