Rom Mirror Function Select Register (Romm) - Fujitsu F2MC-16LX Hardware Manual

23.2

ROM Mirror Function Select Register (ROMM)

The configuration and functions of ROM Mirror Function Select Register (ROMM) are
described.
ROM Mirror Function Select Register (ROMM)
Figure 23.2-1 shows the bit configuration of ROM mirror function select register (ROMM).
Figure 23.2-1 Bit Configuration of ROM Mirror Function Select Register (ROMM)
ROMM Address : 00006F
[bit 9] Reserved bit
It is Reserved bit. Please write "1".
[bit 8] MI
• When "1" is written, ROM data in FF bank can be also read in 00 bank.
• When "0" is written, this function is not available to 00 bank.
• Only writing is enabled.
Notes:
• Do not access to ROMM register in the middle of the operation of the address 008000
00FFFF
• When ROM mirror function is activated, the addresses from FF8000
the addresses from 008000
FF7FFF
CHAPTER 23 ROM MIRROR FUNCTION SELECTION MODULE
bit
15 14
H
.
H
to 00FFFF
H
are not mirrored even though ROM mirror function is set.
H
13 12 11 10
Reserved
of 00 bank. So ROM addresses under the address
H
initial value
9 8
MI 11
B
R/W W
to FFFFFF are mirrored to
H H
to
H
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