UPD77019 datasheet(20/56 Pages) NEC

20 / 56 page

µPD77018A, 77019

2.4.1

Instruction RAM Outline

The

µPD77018A has an instruction ROM (24K words × 32 bits) and instruction RAM (256 words × 32 bits).

The

µPD77019 has an instruction ROM (24K words × 32 bits) and instruction RAM (4K 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)

PD77019

System (24K words)

PD77018A

4000H

3FFFH

System (24K words)

A000H

9FFFH

0200H

01FFH

System (256 words)

Bootup ROM (256 words)

Vector (64 words)

System (11.5K words)

Internal Instruction RAM

(4K words)

System (256 words)

Bootup ROM (256 words)

Vector (64 words)

System (15.25K words)

Internal Instruction RAM

(256 words)

Internal Instruction ROM

(24K words)

0100H

00FFH

µµ

1200H

11FFH

FFFFH

UPD77019 Datasheet(PDF) 20 Page - NEC

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