Memory Access Mode - Fujitsu 8FX Hardware Manual

CHAPTER 1 MEMORY ACCESS MODE

1.1 Memory Access Mode

1.1 Memory Access Mode
The MB95630H Series supports only one memory access mode: single-chip
mode.
■ Single-chip Mode
In single-chip mode, only the internal RAM and the Flash memory are used, and no external
bus access is executed.
●
Mode data
Mode data is the data used to determine the memory access mode of the CPU.
The mode data address is fixed at "0xFFFD". Always set the mode data of the Flash memory to
"0x00" to select the single-chip mode.
Address bit7 bit6
0xFFFD
After a reset is released, the CPU fetches mode data first.
The CPU then fetches the reset vector after the mode data. It starts executing instructions from
the address set in the reset vector.
2
Figure 1.1-1 Mode Data Settings
bit5 bit4 bit3
Data
0x00 Selects single-chip mode.
Other than 0x00 Reserved. Do not set mode data to any value other than 0x00.
FUJITSU SEMICONDUCTOR LIMITED
bit2 bit1 bit0
Operation
MB95630H Series
MN702-00009-2v0-E