MB91121 datasheet(18/97 Pages) FUJITSU

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MB91121

Registers

The FR family has two types of registers; dedicated registers embedded on the CPU and general-purpose

registers on memory.

• Dedicated registers

Program counter (PC)

: 32-bit length, indicates the location of the instruction to be executed.

Program status (PS)

: 32-bit length, register for storing register pointer or condition codes

Table base register (TBR)

: Holds top address of vector table used in EIT (Exceptional/Interrupt/Trap)

processing.

Return pointer (RP)

: Holds address to resume operation after returning from a subroutine.

System stack pointer (SSP) : Indicates system stack space.

User’s stack pointer (USP)

: Indicates user’s stack space.

Multiplication/division result register (MDH/MDL) : 32-bit length, register for multiplication/division

• Program status (PS)

The PS register is for holding program status and consists of a condition code register (CCR) , a system condition

code register (SCR) and a interrupt level mask register (ILM) .

32 bit

Initial value

Program counter

XXXX XXXXH Indeterminate

Program status

TBR

Table base register

0 0 0 F FC0 0H

Return pointer

XXXX XXXXH Indeterminate

SSP

System stack pointer

0000 0000H

USP

User’s stack pointer

XXXX XXXXH Indeterminate

MDH

XXXX XXXXH Indeterminate

Multiplication/division result register

MDL

XXXX XXXXH Indeterminate

9876543210

 ILM4 ILM3 ILM2 ILM1 ILM0 



ILM

SCR

CCR

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