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MB90335 Series
20.2
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 20.2-1 shows the bit configuration of ROM mirror function select register (ROMM).
Figure 20.2-1 Bit Configuration of ROM Mirror Function Select Register (ROMM)
ROMM Address : 00006F
[bit9] Reserved bit
It is Reserved bit. Please write "1".
[bit8] 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
CM44-10137-6E
bit
15
14
H
.
H
to 00FFFF
H
are not mirrored even though ROM mirror function is set.
H
FUJITSU MICROELECTRONICS LIMITED
CHAPTER 20 ROM MIRROR FUNCTION SELECTION MODULE
20.2 ROM Mirror Function Select Register (ROMM)
13
12
11
of 00 bank. So ROM addresses under the address
H
initial value
10
9
8
- - - - - - 11
Reserved
MI
R/W
W
to FFFFFF
H
H
B
to
H
are mirrored to
457
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