MB95F116NS データシートの表示（PDF） - Fujitsu

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MB95F116NS

8-bit Microcontrollers

Fujitsu 

MB95110M Series

2. Register

The MB95110M series has two types of registers; dedicated registers in the CPU and general-purpose registers

in the memory. 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 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.

16-bit

PC

AH

AL

TH

TL

IX

EP

SP

PS

: Program counter

: Accumulator

: Temporary accumulator

: Index register

: Extra pointer

: Stack pointer

: Program status

Initial Value

FFFDH

0000H

0000H

0000H

0000H

0000H

0030H

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.)

• Structure of the program status

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

PS R4 R3 R2 R1 R0 DP2 DP1 DP0 H

I IL1 IL0 N Z V

C

RP

DP

CCR

21

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