MB91354A Ver la hoja de datos (PDF) - Fujitsu

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MB91354A

32-Bit Proprietary Microcontroller

Fujitsu 

MB91350A Series

4. Register

General purpose registers

R0

R1

R12

R13

R14

R15

32-bit

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 0000 0000H (SSP value).

• PS (Program Status)

This register holds the program status and is divided into the ILM, SCR, and CCR.

The undefined bits in the following illustration are all reserved bits. Reading these bits always returns “0”. Writing

to them has no effect.

Bit position→ 31

20

16

10 8 7

0

⎯

⎯

ILM

PS

SCR

CCR

26

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