Fujitsu MB91150 Series Hardware Manual page 53

I General-purpose registers
Figure 3.3-2 "General-purpose register configuration" shows the configuration of the general-
purpose register.
Registers R0 to R15 are general-purpose registers. They are used as accumulators for various
types of operation or as for storing memory access pointers.
Of the 16 registers, those shown below are supposed to be used for special purposes, and
therefore some instructions have been enhanced.
• R13: Virtual accumulator
• R14: Frame pointer
• R15: Stack pointer
The initial values of R0 to R14 after resetting are undefined. The initial value of R15 is
00000000
CHAPTER 3 MEMORY SPACE, CPU AND CONTROL UNIT
Figure 3.3-2 General-purpose register configuration
32 Bit
R1
R2
:
R12
AC
R13
R14 FP
R15 SP
(SSP value).
H
[Initial value]
XXXX XXXX
XXXX XXXX
: :
XXXX XXXX
XXXX XXXX
XXXX XXXX
0000 0000
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