MB89580B データシートの表示（PDF） - Fujitsu

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MB89580B

8-bit Proprietary Microcontrollers

Fujitsu 

MB89580B/580BW series

2. Registers

The MB89580B/BW series has two types of registers; the registers dedicated to specific purposes in the CPU

and the general-purpose registers.

The dedicated registers are as follows:

Program counter (PC)

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

Accumulator (A)

: A 16-bit register for temporary storage of operations. In the case of an 8-bit data

processing instruction, the lower one byte is used.

Temporary accumulator (T) : A 16-bit register which performs operations with the accumulator. In the case of

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

Index register (IX)

: A 16-bit register for index modification.

Extra pointer (EP)

: A 16-bit register 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 to store a register pointer or a condition code.

16 bits

PC

A

T

IX

EP

SP

RP

CCR

PS

: Program counter

: Accumulator

: Temporary accumulator

: Index register

: Extra pointer

: Stack pointer

: Program status

Initial value

FFFDH

Indeterminate

Indeterminate

Indeterminate

Indeterminate

Indeterminate

I-flag = 0, IL1, 0 = 11

Initial values for other

bits are indeterminate.

15

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