UPD784938 datasheet(82/733 Pages) NEC

Part #	UPD784938

Description	16-Bit Single-Chip Microcontrollers

PDF	733 Pages

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Manufacturer	NEC [NEC]

Direct Link	http://www.nec.com/

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82 / 733 page

82

CHAPTER 3 CPU ARCHITECTURE

Preliminary User’s Manual U13987EJ1V0UM00

3.6

µPD78F4938 Memory Mapping

The memory size switching register (IMS) specifies the internal memory size. With the

µPD78F4938, users are able to select

the internal memory capacity using the IMS so that the same memory map as that of mask ROM versions with a different internal

memory capacity can be achieved.

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

RESET input sets IMS to FFH.

Figure 3-6. Internal Memory Size Switching Register (IMS)

Caution

The IMS is not contained in mask ROM products (

µPD784935, 784936, 784937, 784938).

The IMS setting to obtain the same memory map as mask ROM products are shown in Table 3-3.

Table 3-3. Internal Memory Size Switching Register (IMS) Setting Value

Mask ROM Product

IMS Setting Value

µPD784935

DDH

µPD784936

EEH

µPD784937

FFH

µPD784938

CCH

7

1

Address: 0FFFCCH

After reset: FFH

W/R

6

1

5

ROM1

4

ROM0

3

1

2

1

RAM1

0

RAM0

IMS

Internal ROM Capacity Selection

ROM1

ROM0

Internal RAM Capacity Selection

RAM1

RAM0

0

1

0

1

0

1

10,240 bytes

5,120 bytes

6,656 bytes

8,192 bytes

0

1

0

1

0

1

256 Kbytes

96 Kbytes

128 Kbytes

192 Kbytes

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