upd78f0148m1gka1-9eu Renesas Electronics Corporation., upd78f0148m1gka1-9eu Datasheet - Page 487

• Manufacturer Part Number: upd78f0148m1gka1-9eu
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

28.1 Internal Memory Size Switching Register
register (IMS) so that the same memory map as that of the mask ROM versions with a different internal memory
capacity can be achieved.
The
IMS is set by an 8-bit memory manipulation instruction.
RESET input sets IMS to CFH.
Caution The initial value of IMS is CFH. Be sure to set the value of the relevant mask ROM version at
The IMS settings required to obtain the same memory map as mask ROM versions are shown in Table 28-2.
Caution When using a mask ROM version, be sure to set the value indicated in Table 28-2 to IMS.
Address: FFF0H
Symbol
IMS
µ
PD78F0148 allows users to select the internal memory capacity using the internal memory size switching
initialization.
RAM2
RAM2
ROM3
Figure 28-1. Format of Internal Memory Size Switching Register (IMS)
7
1
0
1
1
1
After reset: CFH
Table 28-2. Internal Memory Size Switching Register Settings
Other than above
ROM2
RAM1
RAM1
Other than above
6
1
1
0
1
1
µ
µ
µ
µ
Target Mask ROM Versions
PD780143
PD780144
PD780146
PD780148
R/W
ROM1
RAM0
RAM0
CHAPTER 28
User’s Manual U15947EJ3V1UD
5
0
1
0
0
1
1024 bytes
Setting prohibited
ROM0
4
0
0
0
0
1
PD78F0148
Internal high-speed RAM capacity selection
24 KB
32 KB
48 KB
60 KB
Setting prohibited
IMS Setting
ROM3
CCH
3
C6H
C8H
CFH
Internal ROM capacity selection
ROM2
2
ROM1
1
ROM0
0
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