NEC uPD78053Y User Manual

1

1

48 Kbytes

56 Kbytes

1

1

0

1

0

0

7

RAM2

Symbol

IMS

6

RAM1

5

RAM0

4

0

3

ROM3

2

ROM2

1

ROM1

0

ROM0

Address

FFF0H

After

Reset

R/W

R/W

Internal ROM size selection

ROM3

60 Kbytes

1

ROM2

1

ROM1

1

ROM0

1

Setting prohibited

Other than above

Internal high-speed RAM size selection

RAM2 RAM1 RAM0

1024 bytes

1

1

0

Setting prohibited

Other than above

1

1

32 Kbytes

40 Kbytes

0

0

0

1

0

0

0

0

16 Kbytes

24 Kbytes

1

1

0

1

0

0

512 bytes

0

1

0

This register specifies the internal memory size.  In principle, use IMS in a default status.  However, when

using the external device expansion function with the 

µ

PD78058, set IMS so that the internal ROM capacity

is 56 Kbytes or lower.

IMS is set with an 8-bit memory manipulation instruction.

RESET input sets this register to the value indicated in Table 22-3.

The values after reset depend on the product.  (See Table 22-3)

Part number

Reset value

µ

PD78052, 78052Y

44H

µ

PD78053, 78053Y

C6H

µ

PD78054, 78054Y

C8H

µ

PD78055, 78055Y

CAH

µ

PD78056, 78056Y

CCH

µ

PD78058, 78058Y

CFH