Memory Access Mode - Fujitsu F2MC-8FX Hardware Manual

CHAPTER 4 MEMORY ACCESS MODE
4.1

Memory Access Mode

The memory access mode supported by the MB95170J series is only single-chip mode.
Single-chip Mode
Single-chip mode uses only internal RAM and ROM without using an external bus access.
Mode data
Mode data is used to determine the memory access mode of the CPU.
The mode data address is fixed as FFFD
data of internal ROM to 00
Address
FFFD
After a reset, the CPU fetches mode data first.
The CPU then fetches the reset vector after the mode data. The instruction is performed from the address
set by reset vector.
Mode pin (MOD)
Be sure to set the mode pin (MOD) to "V
30
to select single-chip mode.
H
Figure 4.1-1 Mode Data Settings
bit7 bit6 bit5
H
Data
00
Other than 00
(The value of FFFC
H
bit4 bit3 bit2
Select single-chip mode.
H
Reserved. Do not make any setting.
H
".
SS
can be any value). Be sure to set the mode
H
bit1 bit0
Operation