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The Microchip XC8 compiler is a C compiler that can target Microchip's PIC 10/12/16/18 range of 8-bit microcontrollers. A free version is available that offers less optimization than paid versions.

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MPLAB XC8 + PIC18 + external memory = Error 712 (can't generate code for this expression)

I'm currently having a bad time trying to use an external RAM chip (512 kB) with a PIC18F8720 and the Microchip XC8 compiler (v1.35, PRO mode). … /v1.35/bin/xc8" --pass1 --chip=18F8720 -Q -G --double=24 --float=24 --emi=byteselect --ram=default,+20000-9FFFF --opt=default,+asm,+asmfile,-speed,+space,-debug --addrqual=require --mode=pro -P -N255 …
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