MB89538APFM 查看數據表（PDF） - Fujitsu

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MB89538APFM

F2MC-8L MB89530A Series / 8-bit Original Microcontroller CMOS

Fujitsu 

MB89530A Series

2. Registers

The F2MC-8L series has two types of registers, dedicated-use registers within the CPU, and general-purpose

registers in memory.

Program counter (PC)

: 16-bit length, shows the location where instructions are stored.

Accumulator (A)

: 16-bit length, a temporary memory register for calculation operations.

The lower byte is used for 8-bit data processing instructions.

Temporary accumulator (T) : 16-bit length, performs calculations with the accumulator.

The lower byte is used for 8-bit data processing instructions.

Index register (IX)

: 16-bit length, a register for index modification.

Extra pointer (EP)

: 16-bit length, a pointer indicating memory addresses.

Stack pointer (SP)

: 16-bit length, indicates stack areas.

Program status (PS)

: 16-bit length, contains register pointer and condition code.

16 bits

PC

A

T

IX

EP

SP

PS

: Program counter

: Accumulator

: Temporary accumulator

: Index register

: Extra pointer

: Stack pointer

: Program status

Initial value

FFFDH

Not fixed

Not fixed

Not fixed

Not fixed

Not fixed

I-flag = 0, IL1, 0 = 11

Other bits not fixed

In addition, the PS register can be divided so that the upper 8 bits are used as a register bank pointer (RP), and

the lower 8 bits as a condition code register (CCR). (See the following illustration.)

• Program status register configuration

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

PS

RP

Open Open Open H I IL1 IL0 N Z V C

RP

CCR

25

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