Constant tables can be allocated within the entire address space of program memory. Since program
memory can not be accessed directly, it has been mapped to the data memory. The
mapped program memory begins at byte address 0x4000 in data memory (see Figure 5-1 on
page 15). Although programs are executed starting from address 0x000 in program memory it
must be addressed starting from 0x4000 when accessed via the data memory.
Internal write operations to Flash program memory have been disabled and program memory
therefore appears to firmware as read-only. Flash memory can still be written to externally but
internal write operations to the program memory area will not be succesful.
Timing diagrams of instruction fetch and execution are presented in “Instruction Execution Timing”
on page 9.