How do you locate variables in a specific memory segment or at a certain memory address using the Keil 'C' compiler?
The Keil C compiler uses the C extensions data, idata, bdata, xdata, pdata, and code to define the 8051 memory segment and addressing mode for a particular variable. As described in Chapter 6, Section 'Accessing Absolute Memory Locations' of the Keil Cx51 Compiler User's Guide:
The C programming language does not provide a method of explicitly specifying the memory location of a static or global variable. You must do that manually using one of the following three methods: