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UPD784938 Datasheet(PDF) 82 Page - NEC

Part # UPD784938
Description  16-Bit Single-Chip Microcontrollers
Download  733 Pages
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Manufacturer  NEC [NEC]
Direct Link  http://www.nec.com/
Logo NEC - NEC

UPD784938 Datasheet(HTML) 82 Page - NEC

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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
1
RAM1
0
RAM0
IMS
Internal ROM Capacity Selection
ROM1
ROM0
Internal RAM Capacity Selection
RAM1
RAM0
0
0
1
1
0
1
0
1
10,240 bytes
5,120 bytes
6,656 bytes
8,192 bytes
0
0
1
1
0
1
0
1
256 Kbytes
96 Kbytes
128 Kbytes
192 Kbytes


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