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

25.2 ROM Mirror Function Select Register (ROMM)

This section describes the configuration and functions of the ROM mirror function
selection register (ROMM).
I ROMM (ROM mirror function select register)
The diagram below shows the bit configuration of the ROM mirror function selection register
(ROMM).
ROMM address: 00006F
[Bit8] MI
• If set to "1", ROM data in the FF bank can be read via Bank 00.
• If set to "0", reading via Bank 00 is not enabled.
• This bit is a write-only bit.
Note:
• Do not access this register while accesses to address 004000
• At the start of the ROM mirror function, addresses FF4000
addresses 004000
mirrored in Bank 00 even if the ROM mirror function is enabled.
CHAPTER 25 ROM MIRROR FUNCTION SELECTION MODULE
15 14 13
Bit
- - -
H
to 00FFFF in Bank 00. ROM addresses of FF3FFF
H H
12 11 10 9
- - - -
H
to FFFFFF
H
8 Initial value
MI -------1
R
W
to 00FFFF are in progress.
H
are mirrored at the
H
or below are not
H
467