upd78f0124hgba1-8et-a Renesas Electronics Corporation., upd78f0124hgba1-8et-a Datasheet - Page 386

• Manufacturer Part Number: upd78f0124hgba1-8et-a
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

24.1 Internal Memory Size Switching Register
Table 24-2.
386
The internal memory capacity can be selected using the internal memory size switching register (IMS).
IMS can be 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 each product to the values
The IMS settings required to obtain the same memory map as mask ROM versions of the 78K0/KD1 are shown in
Address: FFF0H
Symbol
IMS
shown in Table 24-2 at initialization. Also, when using the 78K0/KD1+ to evaluate the program of
a mask ROM version of the 78K0/KD1, be sure to set the values shown in Table 24-2.
RAM2
RAM2
ROM3
Figure 24-1. Format of Internal Memory Size Switching Register (IMS)
7
0
1
0
0
0
1
µ
µ
µ
After reset: CFH
PD78F0122H
PD78F0123H
PD78F0124H, 78F0124HD
Flash Memory Version
Table 24-2. Internal Memory Size Switching Register Settings
Other than above
(78K0/KD1+)
RAM1
RAM1
ROM2
Other than above
6
1
1
0
1
1
0
−
R/W
User’s Manual U16962EJ3V0UD
CHAPTER 24 FLASH MEMORY
RAM0
RAM0
ROM1
5
0
0
1
0
1
0
µ
µ
µ
µ
PD780121
PD780122
PD780123
PD780124
Target Mask ROM Version
512 bytes
1024 bytes
Setting prohibited
ROM0
4
0
0
0
0
0
(78K0/KD1)
Internal high-speed RAM capacity selection
8 KB
16 KB
24 KB
32 KB
Setting prohibited
ROM3
3
Internal ROM capacity selection
ROM2
IMS Setting
2
C6H
C8H
42H
44H
ROM1
1
ROM0
0