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Write R7 register directly from C

I use KeilC uVision4 for 89C51 MCU.
By "Inline ASM", i can easily direct write value to R7 register, like this :

    #pragma ASM
        MOV R7, #10
    #pragma ENDASM


But now, there are some reason that i have to write to R7 register direct from C (not from inline ASM), eg:

    R7 = 10;


Of course, the C compiler does not understand R7 as MCU Register (not Inline ASM).

-> Is there anyway to solve this problem. Please help me if anyone know, thanks a lot !

Parents
  • .. I will repeat

    DO NOT MESS WITH REGISTERS IN INLINE ASM

    you are hellbent on doing it this way and in a while you will come crying here "why does this not work" when you run into a conflict between your inline and the compilers register usage which legally can be any which way and be changed at any time.

    Erik

Reply
  • .. I will repeat

    DO NOT MESS WITH REGISTERS IN INLINE ASM

    you are hellbent on doing it this way and in a while you will come crying here "why does this not work" when you run into a conflict between your inline and the compilers register usage which legally can be any which way and be changed at any time.

    Erik

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