UPD780921 datasheet(14/40 Pages) RENESAS

14 / 40 page

µPD780921, 780922, 780923, 780924

4. MEMORY SPACE

The memory map of the

µPD780921, 780922, 780923, and 780924 is shown in Figure 4-1.

Figure 4-1. Memory Map

Data Memory

Space

Program

Memory Space

Special Function

256 x 8 bits

General-Purpose

32 x 8 bits

Use Prohibited

External Memory

Intenal High-Speed

RAMNote

Internal ROMNote

Program Area

CALLF Entry Area

Program Area

CALLT Table Area

Vector Table Area

FFFFH

FF00H

FEFFH

FEE0H

FEDFH

mmmmH

F800H

F7FFH

nnnnH

0000H

nnnnH

1000H

0FFFH

0800H

07FFH

0080H

007FH

0040H

003FH

0000H

mmmmH – 1

n n n n H + 1

Note

The internal ROM and internal high-speed RAM capacity differ depending on the product (see the table below).

Intenal ROM End Address

nnnnH

Product Name

µPD780921

µPD780922

µPD780923

µPD780924

1FFFH

3FFFH

5FFFH

7FFFH

Internal High-Speed RAM

Start Address

mmmmH

FD00H

FB00H

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