NEC PD78058F(A) Manuale Utente

µ

7

0

Symbol

IXS

6

0

5

0

4

0

3

IXRAM3

2

IXRAM2

1

IXRAM1

0

IXRAM0

Address

FFF4H

0AH

After

Reset

Internal Extension RAM Capacity Selection

IXRAM3 IXRAM2 IXRAM1

1024 bytes

1

0

1

Setting prohibited

Other than above

IXRAM0

0

R/W

W

0 bytes

1

1

0

0

The internal expansion RAM size of the 

µ

PD78P058F and 78P058FY can be defined using the internal expansion

RAM size switching register (IXS), thus enabling memory mapping that is the same as that of mask ROM products

with different internal expansion RAM.  The IXS is set by an 8-bit memory manipulation instruction.

RESET signal input sets IXS to 0AH.

The value in the IXS that has the identical memory map to the mask ROM versions is given in Table 26-3.

Pertinent Mask ROM Versions

Value Set to IXS

µ

PD78056F, 78056FY

µ

PD78058F, 78058FY

If a program for the 

µ

PD78P058F or 78P058FY which includes “MOV IXS, #0CH” is implemented with

the 

µ

PD78056F, or 78056FY, this instruction is ignored and causes no malfunction.

0CH

0AH