2 project codes to be placed in the same RL78G23

1.  You can load symbols from both projects, but if there are duplicate names the latest loaded project will apply.  The method differs between CS+ and e2studio, which are you using (or are you using IAR Embedded Workbench)?

2.  Function call or branch can  be done, either from C or asm, usually to a known, fixed entry point of each project.

3.  Depending on how you structure your projects, it might be easier to have separate / independent projects so that RAM can be easily be allocated to both projects.

It appears that you don't intend to have a boot-loader to handle which project is active, or for programming the flash memory.  This device does not support the so-called dual-operation that would allow programming one bank of code-flash while executing from the other, and also does not support relocation of the vector ISRs.  As such some strategy / customization is required to manage these things.

You might to have a look at the app-note and associated sample code for the FW Update (r01an6374), it may not be what you are wanting it will give you some ideas.

Hello Jim B.

I use e2 studio
I jumped from project 1 to project 2, but the vector is still from project 1,
Because the vector is placed after 0~7F instead of 80000,
How should I get the vector content of project 2? And how to write it after jumping to project 2?
I'm not sure if this will work correctly on the RL78G23 project 2

I tried to use the flash swap function and set the application area after 0x4000, but when executing r_RequestBootSwap, an ENUM_RET_ERR_WRITE error will be returned,
Do you know the reason?

Thanks and Regards,

Hello Jim B.

I use e2 studio
I jumped from project 1 to project 2, but the vector is still from project 1,
Because the vector is placed after 0~7F instead of 80000,
How should I get the vector content of project 2? And how to write it after jumping to project 2?
I'm not sure if this will work correctly on the RL78G23 project 2

I tried to use the flash swap function and set the application area after 0x4000, but when executing r_RequestBootSwap, an ENUM_RET_ERR_WRITE error will be returned,
Do you know the reason?

Thanks and Regards,

Hello,

The vector table is only one and resides in start of boot cluster 0 or 1 ( so 0x0000_0000 or 0x0000_4000 ).

As mentioned there is one dual bank operation, so you may need to re-consider that architecture of your application.