General Purpose Registers - Fujitsu MB91401 Datasheet

32-bit proprietary microcontroller lsi network security system
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Prelminary
2004.11.12

GENERAL PURPOSE REGISTERS

R0
R1
R12
R13
R14
R15
Registers R0 to R15 are general-purpose registers. The registers are used as the accumulator and memory
access pointers for CPU operations.
Of these 16 registers, the registers listed below are intended for special applications, for which some instructions
are enhanced.
R13: Virtual accumulator
R14: frame pointer
R15:Stack pointer
The initial values of R0 to R14 after a reset are indeterminate. R15 is initialized to 00000000
32 bits
AC
FP
SP
MB91401
Initial Value:
XXXX XXXX
H
XXXX XXXX
H
0000 0000
H
(SSP value).
H
31

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