CHAPTER 26 FLASH MEMORY
User’s Manual U16899EJ2V0UD
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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 input sets IMS to CFH.
Caution The initial value of IMS is CFH. Be sure to set each product to the values shown in Table 26-2 at
initialization. Also, when using the 78K0/KE1+ to evaluate the program of a mask ROM version
of the 78K0/KE1, be sure to set the values shown in Table 26-2.
Figure 26-1. Format of Internal Memory Size Switching Register (IMS)
Address: FFF0H After reset: CFH R/W
Symbol 7 6 5 4 3 2 1 0
IMS
RAM2 RAM1 RAM0
0
ROM3 ROM2 ROM1 ROM0
RAM2 RAM1 RAM0
Internal
high-speed RAM capacity selection
0 1 0
512
bytes
1 1 0
1024
bytes
Other than above
Setting prohibited
ROM3 ROM2 ROM1 ROM0
Internal
ROM
capacity
selection
0 0 1 0
8
KB
0 1 0 0
16
KB
0 1 1 0
24
KB
1 0 0 0
32
KB
1 1 0 0
48
KB
1 1 1 1
60
KB
Other than above
Setting prohibited
The IMS settings required to obtain the same memory map as mask ROM versions of the 78K0/KE1 are shown in
Table 26-2.
Table 26-2. Internal Memory Size Switching Register Settings
Flash Memory Versions
(78K0/KE1+)
Target Mask ROM Versions
(78K0/KE1)
IMS Setting
−
µ
PD780131 42H
µ
PD78F0132H
µ
PD780132 44H
µ
PD78F0133H
µ
PD780133 C6H
µ
PD78F0134H
µ
PD780134 C8H
µ
PD78F0136H
µ
PD780136 CCH
µ
PD78F0138H, 78F0138HD
µ
PD780138
CFH
Содержание MuPD78F0132H
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