Hi, I developed a lot on the M16C62 (and colleagues continues to use it) I used the Renesas compiler, then I moved to KPIT www.kpitgnutools.com/releaseNotes.php ;RN=226 ( now moved to https://gcc-renesas.com/ ) and then finally I build myself the gcc compiler ( calcoen.web.cern.ch/.../build_gcc_1.htm ) that was for me the best solution, Eclipse + gcc (cross compiler) for debugging I used the "debugging" serial port of M16C62 when start in "debugging" mode. just a normal serial port of a PC connected to the M16C62 that needs to startup in "debug" mode and you need to put the "monitor" program in the ROM to be able to debug all free and all source code available
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