MB91155 datasheet(21/105 Pages) FUJITSU

21 / 105 page

MB91F155A/MB91155/MB91154

Registers

The family of FR microcontrollers has two types of registers : the registers residing in the CPU which are dedicated

to applications and the general-purpose registers residing in the memory.

• Dedicated registers :

• Program status (PS)

The PS register holds program status and is further divided into three registers which are a Condition Code

Program counter (PC)

: A 32-bit register to indicate the location where an instructions is stored.

Program status (PS)

: A 32-bit register to store a register pointer or a condition code.

Tablebase register (TBR)

: Holds the vector table lead address used when EIT (exceptions/interrupt/

trap) is processed.

Return pointer (RP)

: Holds the address to return from a subroutine to.

System stack pointer (SSP)

: Points to the system stack space.

User stack pointer (USP)

: Points to the user stack space.

Multiplication and division result register (MDH/MDL) : A 32-bit multiplication and division register.

TBR

SSP

USP

MDH

MDL

Program counter

Program status

Tablebase register

Return pointer

System stack pointer

User stack pointer

Multiplication and division register

(Undefined)

XXXX XXXXH

0000 0000H

000F FC00H

32 bit

Initial value

ILM4 ILM3 ILM2

ILM

SCR

CCR

ILM1 ILM0

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