UPD78P018F datasheet(21/78 Pages) RENESAS

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µPD78P018F

3. INTERNAL MEMORY SIZE SWITCHING REGISTER (IMS)

This register is used to disable the use of part of the internal memory by software. By setting this register (IMS),

it is possible to get the same memory map as that of the mask ROM versions with a different internal memory (ROM,

RAM).

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

RESET input sets IMS to CFH.

Figure 3-1. Internal Memory Size Switching Register Format

Note When the external device expansion function is used, the internal ROM capacity should be set to 56 Kbytes

or less.

Table 3-1 shows the setting values of IMS which make the memory map the same as that of the mask ROM versions.

Table 3-1. Internal Memory Size Switching Register Setting Values

Target Mask ROM Versions

IMS Setting Values

µPD78011F

42H

µPD78012F

44H

µPD78013F

C6H

µPD78014F

C8H

µPD78015F

CAH

µPD78016F

CCH

µPD78018F

CFH

ROM3

ROM2

ROM1

ROM0

Selection of Internal ROM

Capacity

8 Kbytes

16 Kbytes

24 Kbytes

32 Kbytes

40 Kbytes

48 Kbytes

56 KbytesNote

60 Kbytes

Setting prohibited

Other than above

RAM2

RAM1

RAM0

Selection of Internal High-Speed RAM

Capacity

512 bytes

1024 bytes

Setting prohibited

Other than above

RAM0

RAM1

RAM2

ROM0

ROM2 ROM1

ROM3

IMS

FFF0H

CFH

Symbol

Address

After reset

R/W

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