MB95F104AJS datasheet(23/72 Pages) FUJITSU

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MB95100AM Series

The MB95100AM series has two types of registers; dedicated registers in the CPU and general-purpose registers

in the memory. The dedicated registers are as follows:

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 one 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 one 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-bit

: Accumulator

: Temporary accumulator

: Index register

: Extra pointer

: Stack pointer

: Program status

Initial Value

FFFDH

0000H

0030H

CCR

bit 15 bit 14 bit 13 bit 12 bit 11 bit 10 bit 9

bit 8

DP2

DP1

DP0

bit 7

bit 6

bit 5

bit 4

bit 3

bit 2

bit 1

bit 0

IL1

IL0

• Structure of the Program Status

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