upd78f0103hmca1-5a4-a Renesas Electronics Corporation., upd78f0103hmca1-5a4-a Datasheet - Page 333

• Manufacturer Part Number: upd78f0103hmca1-5a4-a
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

21.1 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 input sets IMS to CFH.
Caution The initial value of IMS is “setting prohibited (CFH)”. Be sure to set the value shown in Table 21-
The IMS settings required to obtain the same memory map as mask ROM versions are shown in Table 21-2.
Address: FFF0H
Symbol
IMS
2 for each product at initialization. When using the 78K0/KB1+ to evaluate the program of a mask
ROM version of the 78K0/KB1, be sure to set the values shown in Table 21-2.
µ
µ
µ
RAM2
RAM2
ROM3
PD78F0101H
PD78F0102H
PD78F0103H
Figure 21-1. Format of Internal Memory Size Switching Register (IMS)
Flash Memory Version
7
0
0
0
0
0
After reset: CFH
Table 21-2. Internal Memory Size Switching Register Settings
(78K0/KB1+)
Other than above
ROM2
RAM1
RAM1
Other than above
6
0
1
0
1
1
R/W
CHAPTER 21 FLASH MEMORY
ROM1
RAM0
RAM0
User’s Manual U16846EJ3V0UD
5
0
0
1
0
1
µ
µ
µ
Target Mask ROM Version
PD780101
PD780102
PD780103
(78K0/KB1)
768 bytes
512 bytes
Setting prohibited
ROM0
4
0
0
0
0
Internal high-speed RAM capacity selection
8 KB
16 KB
24 KB
Setting prohibited
ROM3
3
42H
04H
06H
Internal ROM capacity selection
Switching Register (IMS)
Internal Memory Size
ROM2
2
ROM1
1
ROM0
0
333