MSM80C88A-10GS-K 데이터 시트보기 (PDF) - Oki Electric Industry

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MSM80C88A-10GS-K

8-Bit CMOS MICROPROCESSOR

Oki Electric Industry 

¡ Semiconductor

Memory Organization

64KB

Segment

Register File

CS

SS

DS

ES

+Offset

FFFFFH

Code Segment

XXXXOH

Stack Segment

Data Segment

Extra Data Segment

OOOOOH

MSM80C88A-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 override.

Minimum and Maximum Modes

The MSM80C88A-10 has two system modes: minimum and maximum. When using the

maximum mode, it is easy to organize a multiple-CPU system with the MSM82C88-2 Bus

Controller which generates the bus control signal.

When using the minimum mode, it is easy to organize a simple system by generating the bus

control signal itself. MN/MX is the mode select pin. Definition of 24-31, 34 pin changes depends

on the MN/MX pin.

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