UPD78P048A datasheet(21/73 Pages) RENESAS

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µPD78P048A

Data Sheet U10611EJ2V1DS

3. MEMORY SIZE SWITCHING REGISTER (IMS)

This is a register to disable use of part of internal memories by software. By setting this memory size switching

memories.

The IMS is set up by the 8-bit memory manipulation instruction.

CFH will result by the RESET input.

Figure 3-1. Memory Size Switching Register Format

Symbol

IMS

Address

R/W

FFF0H

CFH

On Reset

R/W

RAM2

RAM1

RAM0

ROM3 ROM2 ROM1 ROM0

765432

Selection of Internal

ROM3 ROM2 ROM1 ROM0

ROM Capacity

0100

16K bytes

0110

24K bytes

1000

32K bytes

1010

40K bytes

1111

60K bytes

Other than above

Setting prohibited

Selection of Internal

RAM2

RAM1

RAM0

High-Speed RAM Capacity

010

512 bytes

110

1024 bytes

Other than above

Setting prohibited

Table 3-1 shows the setting values of IMS which makes the memory mapping the same as that of the various mask

ROM model.

Table 3-1. Memory Size Switching Register Setting Values

Target Mask ROM Product

IMS Setting Value

µPD78042F

44H

µPD78043F

46H

µPD78044F

C8H

µPD78045F

CAH

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