UPD78014 datasheet(16/42 Pages) NEC

16 / 42 page

µPD780016Y, 780018Y

4. MEMORY SPACE

The memory map of the

µPD780016Y and 780018Y is shown in Figure 4-1.

Figure 4-1. Memory Map

Notes 1. If external device expansion functions are to be employed for the

µPD780018Y, set the size of the

internal ROM to below 56K bytes using the memory size switching register (IMS).

2. The internal ROM capacity depends on the product. (See the following table.)

Part Number

Internal ROM Last Address

nnnnH

µPD780016Y

BFFFH

µPD780018Y

EFFFH

FFFFH

FF00H

FEFFH

FB00H

FAFFH

FEE0H

FEDFH

FAE0H

FADFH

FAC0H

FABFH

F800H

F7FFH

nnnnH+1

nnnnH

0000H

nnnnH

1000H

0FFFH

0800H

07FFH

0080H

007FH

0040H

003FH

0000H

Use prohibited

Internal extended RAM

1024

× 8 bits

Program area

CALLF entry area

Program area

CALLT table area

Vector table area

Special function registers

(SFR) 256

× 8 bits

General-purpose registers

× 8 bits

Internal high-speed RAM

1024

× 8 bits

Internal ROM Note 2

Buffer RAM

× 8 bits

Program

memory

space

Data

memory

space

F400H

F3FFH

Use prohibited Note 1

UPD78014 Datasheet(PDF) 16 Page - NEC

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