MB91360G_05 Datasheet, PDF (66/239 Pages) Fujitsu Component Limited. – 32-bit RISC Microcontroller

MB91360G Series
3. General-Purpose Registers
The general-purpose registers are CPU registers R0 to R15. The register are used as the accumulator for
operations and as pointers (a field indicating an address) for memory access. The user can specify the purpose
for which the general-purpose registers are used.
Register bank structure
32-bits
Initial value
R0
XXXX XXXXH
R1
R12
R13
R14
R15
AC (Accumulator)
FP (Frame Pointer)
SP (Stack Pointer)
XXXX XXXXH
0000 0000H
Among 16 general-purpose registers, the following registers assume a special purpose. This enhances some
instructions.
R13 : Virtual accumulator (AC)
R14 : Frame pointer (FP)
R15 : Stack pointer (SP)
The initial value of R0 to R14 after a reset is indeterminate. The initial value of R15 is 00000000H (SSP value) .
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