General-Purpose Registers - Fujitsu FR60 Hardware Manual

CHAPTER 3 CPU AND CONTROL UNITS
3.3.1

General-Purpose Registers

Registers R0 to R15 are general-purpose registers.
They are used as the accumulator for various arithmetic operations and as pointers for
memory access.
■ 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
value).
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Figure 3.3-2 Configuration of General-Purpose Registers
32 bits
R0
R1
R12
R13 AC
R14 FP
S P
R15
[Initial value]
XXXX XXXX
H
XXXX XXXX
H
0000 0000
H
(SSP
H