General-Purpose Registers - Fujitsu FR60 Hardware Manual

CHAPTER 3 CPU AND CONTROL UNITS
3.5

General-Purpose Registers

Registers R0 to R15 are general-purpose registers. These registers are used as an
accumulator in an operation or a pointer in a memory access.
■ General-purpose Registers
Figure 3.5-1 shows the configuration of the general-purpose registers.
Of these 16 registers, the following are intended for special applications and therefore enhanced
instructions are provided for them:
• R13: Virtual accumulator (AC)
• R14: Frame pointer (FP)
• R15: Stack pointer (SP)
The initial value upon reset is undefined for R0 through R14 and is 00000000
R15.
70
Figure 3.5-1 Configuration of General-purpose Registers
32 bits
R0
R1
... ...
... ...
R12
R13 AC
R14 FP
R15 SP
[Initial value]
XXXX XXXX
H
...
...
...
...
...
XXXX XXXX
H
0000 0000
H
H
(SSP value) for