MB89485L 데이터 시트보기 (PDF) - Fujitsu

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MB89485L

(MB89490 Series) 8-bit Proprietary Microcontroller

Fujitsu 

MB89480/480L Series

2. Registers

The F2MC-8L family has two types of registers; dedicated registers in the CPU and general-purpose registers

in the memory. The following registers are provided:

Program counter (PC)

: A 16-bit register for indicating instruction storage positions.

Accumulator (A)

: A 16-bit temporary register for storing arithmetic operations, etc. When the

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

Temporary accumulator (T) : A 16-bit register for performing arithmetic operations with the accumulator.

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

Index register (IX)

: A 16-bit register for index modification.

Extra pointer (EP)

: A 16-bit pointer for indicating a memory address.

Stack pointer (SP)

: A 16-bit register for indicating a stack area.

Program status (PS)

: A 16-bit register for storing a register pointer, a condition code.

16 bits

PC

A

T

IX

EP

SP

PS

Initial value

: Program counter

FFFDH

: Accumulator

Undefined

: Temporary accumulator Undefined

: Index register

Undefined

: Extra pointer

Undefined

: Stack pointer

Undefined

: Program status

I-flag = 0, IL1, 0 = 11

Other bits are undefined.

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

use as a condition code register (CCR). (See the diagram below.)

Structure of the Program Status Register

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

PS

RP

Vacancy Vacancy Vacancy H I

IL1, 0

NZVC

RP

CCR

21

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