NEC uPD78053(A) Manuale Utente

µ

7

RAM2

Symbol

IMS

6

RAM1

5

RAM0

4

0

3

ROM3

2

ROM2

1

ROM1

0

ROM0

Address

FFF0H

CFH

After

Reset

R/W

R/W

1

Internal ROM Capacity selection

32 Kbytes

ROM3

0

ROM2

0

ROM1

0

ROM0

Setting prohibited

Other than above

Internal High-Speed RAM Capacity Selection

RAM2 RAM1 RAM0

512 bytes

0

1

0

Setting prohibited

Other than above

0

0

16 Kbytes

24 Kbytes

1

1

0

1

0

0

1024 bytes

1

1

0

1

56 Kbytes

1

1

0

1

1

40 Kbytes

48 Kbytes

0

1

1

0

0

0

1

60 Kbytes

1

1

1

µ

The 

µ

PD78P058 allows users to define its internal ROM and high-speed RAM sizes using the memory size

switching register (IMS), so that the same memory mapping as that of a mask ROM version with a different-size internal

ROM and high-speed RAM is possible.  IMS is set with an 8-bit memory manipulation instruction.

RESET input sets IMS to CFH.

µ

The IMS settings to give the same memory map as mask ROM versions are shown in Table 26-4.

µ

Relevant Mask ROM Version

IMS Setting

µ

PD78052, 78052Y

44H

µ

PD78053, 78053Y

C6H

µ

PD78054, 78054Y

C8H

µ

PD78055, 78055Y

CAH

µ

PD78056, 78056Y

CCH

µ

PD78058, 78058Y

CFH