UPD77015 datasheet(21/60 Pages) NEC

21 / 60 page

µPD77015, 77017, 77018

2.4.2

Data Memory Outline

The

µPD77015 has two data memory areas (64K words × 16 bits each) in X and Y memory areas.

Each memory areas consists of 1K words

× 16 bits data RAM and 2K words × 16 bits data ROM . As the

µPD77017 has interface with the external data memory, 16 K words × 16 bits external data memory space can

be add to X/Y memories.

The

µPD77017 has two data memory areas (64K words × 16 bits each) in X and Y memory areas.

Each memory areas consists of 2K words

× 16 bits data RAM and 4K words ×16 bits data ROM . As the

µPD77017 has interface with the external data memory, 16 K words × 16 bits external data memory space can

be add to X/Y memories.

The

µPD77018 has two data memory areas (64K words × 16 bits each) in X and Y memory areas.

Each memory areas consists of 3K words

× 16 bits data RAM and 12K words ×16 bits data ROM . As the

µPD77018 has interface with the external data memory, 16 K words × 16 bits external data memory space can

be add to X/Y memories.

Each data memory area includes on-chip peripheral area which consists of 64 words.

When the external data memory area is accessed, instruction cycle can be 2 or more by wait function.

3840H

383FH

0400H

03FFH

0000H

System (1984 words)

System (11K words)

Data RAM (3K words)

External Data Memory

(16K words)

PD77018

5000H

4FFFH

System (28K words)

PD77017

Peripheral (64 words)

PD77015

4000H

3FFFH

System (30K words)

4800H

47FFH

FFFFH

System (20K words)

0C00H

0BFFH

7000H

6FFFH

External Data Memory

(16K words)

System (1984 words)

Peripheral (64 words)

System (12K words)

Data RAM (2K words)

0800H

07FFH

External Data Memory

(16K words)

C000H

BFFFH

Data ROM (2K words)

Data ROM (4K words)

Data ROM (12K words)

System (1984 words)

Peripheral (64 words)

System (13K words)

Data RAM (1K words)

3800H

37FFH

Caution

When any data is accessed or stored to system address, normal operation of the device is

not assured.

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