UPD78F0838 Renesas Electronics Corporation., UPD78F0838 Datasheet - Page 807

• Manufacturer Part Number: UPD78F0838
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

mounted on the board.
26.1 Internal Memory Size Switching Register
The internal memory capacity can be selected using the internal memory size switching register (IMS).
IMS is set by an 8-bit memory manipulation instruction.
Reset signal generation sets IMS to CFH.
Caution To set the memory size, set IMS and then IXS. Set the memory size so that the internal ROM and
The 78K0/Dx2 incorporates the flash memory to which a program can be written, erased, and overwritten while
Address: FFF0H
Symbol
IMS
Caution Be sure to set each product to the values shown in Table 26-1 after a reset release.
internal expansion RAM areas do not overlap.
PD78F0836
PD78F0844
PD78F0837
PD78F0845
ROM3
RAM2
RAM2
Figure 26-1. Format of Internal Memory Size Switching Register (IMS)
78K0/DE2
7
1
0
1
1
1
After reset: CFH
Table 26-1. Internal Memory Size Switching Register Settings
Other than above
ROM2
RAM1
RAM1
Flash Memory Version
Other than above
6
1
1
0
1
1
PD78F0838, 78F0840, 78F0842
PD78F0846, 78F0848
PD78F0839, 78F0841, 78F0843
PD78F0847, 78F0849
CHAPTER 26 FLASH MEMORY
R/W
Preliminary User’s Manual U19748EJ1V0UD
RAM0
RAM0
ROM1
5
0
1
0
0
1
78K0/DF2
1024 bytes
Setting prohibited
ROM0
0
0
0
1
4
0
Internal high-speed RAM capacity selection
24 KB
32 KB
48 KB
60 KB
Setting prohibited
ROM3
3
C6H
C8H
CCH
CFH
Internal ROM capacity selection
ROM2
IMS Setting
2
ROM1
1
ROM0
0
805