Preliminary User’s Manual U19014EJ1V0UD
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CHAPTER 19 FLASH MEMORY
The
µ
PD78F0730 incorporates the flash memory to which a program can be written, erased, and overwritten while
mounted on the board.
19.1 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 Be sure to set IMS to C4H after a reset release.
Figure 19-1. 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
1
1
0
1024
bytes
Other than above
Setting prohibited
ROM3
ROM2
ROM1
ROM0
Internal ROM capacity selection
0
1
0
0
16
KB
Other than above
Setting prohibited
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