MB91121 Просмотр технического описания (PDF) - Fujitsu

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MB91121

32-bit RISC Microcontroller

Fujitsu 

MB91121

s GENERAL-PURPOSE REGISTERS

R0 to R15 are general-purpose registers embedded on the CPU. These registers functions as an accumulator

and a memory access pointer (field for indicating address) .

• Register bank structure

32 bits

Initial value

R0

XXXX XXXXH

R1

R12

R13

AC (Accumulator)

R14

FP (Frame Pointer)

XXXX XXXXH

R15

SP (Stack Pointer)

0 0 0 0 0 0 0 0H

Of the above 16 registers, following registers have special functions. To support the special functions, part of

the instruction set has been sophisticated to have enhanced functions.

R13 : Virtual accumulator (AC)

R14 : Frame pointer (FP)

R15 : Stack pointer (SP)

Upon reset, values in R0 to R14 are not fixed. Value in R15 is initialized to be 0000 0000H (SSP value) .

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