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sir in my program xdata initialize strating address from 0x20.These external data equalize to some other variable. The example is
unsigned char xdata Dis_data[54] _at_ 0x0200; M_data = xdata (0x200);
is it possible
I have no idea what you're trying to achieve here - please explain.
Please take your time to write a clear & complete description - do not abbreviate!
One thing to note: xdata is a reserved keyword in Keil C51 - you cannot use it as a variable name!
You really do need to spend some time with the Keil Manuals!
- If you want to initialize the data as well as give it a fixed memory location: C51 unfortunately does not allow use of both _at_ keyword and a C initializer with the same variable. Use the linker directives to locate your variable.
- If you want another variable to have the same values; Initialize them both the same way. Initializers in C are constants, not executable code, so you cannot write a static declaration such as "U8 myVar = myOtherVar;" Alternatively, you might do the initialization of the second table at runtime, with either assignment or memcpy().
- If you want two names for the same variable; Why? But if you must, consider a #define for the alias.