MB95F133JS datasheet(19/63 Pages) FUJITSU

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MB95130M Series

The MB95130M series has two types of registers; dedicated registers in the CPU and general-purpose registers

in the memory. The dedicated registers are as include:

The PS can further be divided into higher 8 bits for use as a register bank pointer (RP) and a direct bank pointer

(DP) and the lower 8 bits for use as a condition code register (CCR). (Refer to the diagram below.)

Program counter (PC)

: A 16-bit register to indicate locations where instructions are stored.

Accumulator (A)

: A 16-bit register for temporary storage of arithmetic operations. In the case of

an 8-bit data processing instruction, the lower 1-byte is used.

Temporary accumulator (T)

: A 16-bit register which performs arithmetic operations with the accumulator.

In the case of an 8-bit data processing instruction, the lower 1-byte is used.

Index register (IX)

: A 16-bit register for index modification

Extra pointer (EP)

: A 16-bit pointer to point to a memory address.

Stack pointer (SP)

: A 16-bit register to indicate a stack area.

Program status (PS)

: A 16-bit register for storing a register bank pointer, a direct bank pointer, and

a condition code register

: Program counter

16 bits

: Accumulator

: Temporary accumulator

: Index register

: Extra pointer

: Stack pointer

: Program status

Initial Value

FFFDH

0000H

0030H

CCR

bit15 bit14 bit13 bit12 bit11 bit10

bit9

bit8

DP2

DP1

DP0

bit7

bit6

bit5

bit4

bit3

bit2

bit1

bit0

IL1

IL0

• Structure of the program status

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