MSM80C86A-10JS View Datasheet(PDF) - Oki Electric Industry

Part Name

Description

MFG CO.

MSM80C86A-10JS

16-Bit CMOS MICROPROCESSOR

Oki Electric Industry 

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¡ Semiconductor

Memory Organization

64KB

Segment

Register File

CS

SS

DS

ES

+Offset

FFFFFH

Code Segment

XXXXOH

Stack Segment

Data Segment

Extra Data Segment

OOOOH

MSM80C86A-10RS/GS/JS

Reserved Memory Locations

Reset Bootstrap

Program Jump

FFFFFH

FFFFOH

Interrupt Pointer

for Type 255

3FFH

3FCH

7H

Interrupt Pointer

for Type 1

4H

Interrupt Pointer

3H

for Type 0

0H

Memory Reference Need Segment Register Used

Instructions

CODE (CS)

Stack

STACK (CS)

Local Data

DATA (DS)

External (Global Data)

EXTRA (ES)

Segment Selection Rule

Automatic with all instruction prefetch.

All stack pushes and pops. Memory references

relative to BP base register except data references.

Data references when relative to stack, destination

of string operation, or explicitly overridden.

Destination of string operations: Explicitly

selected using a segment overriden.

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