Texas Instruments MSP430x1xx - Manual (Page 57)

Internal ROM Organization
4-5
Memory
4.3.2 Computed Branches and Calls
Computed branches and subroutine calls are possible using standard
instructions. The call and branch instructions use the same addressing modes
as the other instructions.
The addressing modes allow indirect-indirect addressing that is ideally suited
for computed branches and calls. This programming technique permits a
program structure that is different from conventional 8- and 16-bit
microcontrollers. Most of the routines can be handled easily by using software
status handling instead of flag-type program-flow control.
The computed branch and subroutine calls are valid throughout the entire
ROM space.