Fujitsu MB91401 manual General Purpose Registers, Prelminary, 2004.11.12

Prelminary	MB91401
2004.11.12

■GENERAL PURPOSE REGISTERS

R0

R1

R12

R13

R14

R15

32 bits

AC

FP

SP

Initial Value:

XXXX XXXXH

XXXX XXXXH 0000 0000H

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 00000000H (SSP value).

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