CHAPTER 3 CPU AND CONTROL UNITS
Registers R0 to R15 are general-purpose registers.
They are used as the accumulator for various arithmetic operations and as pointers for
■ General-Purpose Registers
Figure 3.3-2 shows the configuration of the general-purpose registers.
Since it is assumed that the following registers of the 16 registers will be used for specific applications,
some of the instructions have been enhanced accordingly:
R13: Virtual accumulator
R14: Frame pointer
R15: Stack pointer
The initial value after a reset is not defined for R0 to R14. For R15, the initial value is 00000000
Figure 3.3-2 Configuration of General-Purpose Registers