upd78f0114m6gb-8es Renesas Electronics Corporation., upd78f0114m6gb-8es Datasheet - Page 382

• Manufacturer Part Number: upd78f0114m6gb-8es
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

23.1 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.
382
The
IMS is set by an 8-bit memory manipulation instruction.
RESET input sets IMS to CFH.
Caution The initial value of IMS is “setting prohibited (CFH)”.
The IMS settings required to obtain the same memory map as mask ROM versions are shown in Table 23-2.
Caution When using a mask ROM version, be sure to set the value indicated in Table 23-2 to IMS.
Address: FFF0H
Symbol
IMS
µ
PD78F0114 allows users to select the internal memory capacity using the internal memory size switching
Be sure to set the value of the relevant mask ROM version at initialization.
RAM2
RAM2
ROM3
Figure 23-1. Format of Internal Memory Size Switching Register (IMS)
7
0
1
0
0
0
1
After reset: CFH
Table 23-2. Internal Memory Size Switching Register Settings
Other than above
RAM1
RAM1
ROM2
Other than above
6
1
1
0
1
1
0
µ
µ
µ
µ
Target Mask ROM Versions
PD780111
PD780112
PD780113
PD780114
R/W
ROM1
RAM0
RAM0
CHAPTER 23
User’s Manual U16227EJ3V0UD
5
0
0
1
0
1
0
512 bytes
1024 bytes
Setting prohibited
ROM0
4
0
0
0
0
0
PD78F0114
Internal high-speed RAM capacity selection
8 KB
16 KB
24 KB
32 KB
Setting prohibited
IMS Setting
ROM3
3
C6H
C8H
42H
44H
Internal ROM capacity selection
ROM2
2
ROM1
1
ROM0
0