UPD77015GC datasheet(20/60 Pages) NEC

20 / 60 page

µPD77015, 77017, 77018

2.4.1

Instruction RAM Outline

The

µPD77015 has an instruction ROM (4K words × 32 bits) and instruction RAM( 256 words × 32 bits).

The

µPD77017 has an instruction ROM (12K words × 32 bits) and instruction RAM( 256 words × 32 bits).

The

µPD77018 has an instruction ROM (24K words × 32 bits) and instruction RAM( 256 words × 32 bits).

A system vector area is assigned to 64 words of the instruction RAM. Internal instruction RAM is initialized and

rewritten by boot program.

Boot up ROM contains the program loading instruction code to internal instruction RAM.

Caution

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

not assured.

0300H

02FFH

0240H

023FH

0000H

Internal Instruction ROM

(24K words)

PD77018

7000H

6FFFH

System (36K words)

PD77017

PD77015

4000H

3FFFH

System (44K words)

5000H

4FFFH

FFFFH

System (24K words)

A000H

9FFFH

0200H

01FFH

System (256 words)

Bootup ROM (256 words)

Vector (64 words)

System (15.25K words)

Internal Instruction RAM

(256 words)

Internal Instruction ROM

(4K words)

System (256 words)

Bootup ROM (256 words)

Vector (64 words)

System (15.25K words)

Internal Instruction RAM

(256 words)

System (256 words)

Bootup ROM (256 words)

Vector (64 words)

System (15.25K words)

Internal Instruction RAM

(256 words)

Internal Instruction ROM

(12K words)

0100H

00FFH

UPD77015GC Datasheet(PDF) 20 Page - NEC

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