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CHAPTER 23 ROM MIRRORING MODULE
23.2 ROM Mirroring Function Select Register (ROMM)
The ROM mirroring function select register (ROMM) enables or disables the ROM
mirroring function. When the ROM mirroring function is enabled, ROM data in the FF
bank can be read by access to the 00 bank.
■ ROM Mirroring Function Select Register (ROMM)
Figure 23.2-1 ROM Mirroring Function Select Register (ROMM)
Note:
While the ROM area at addresses "008000
H
" to "00FFFF
H
" is being used, access to the ROM mirroring
function select register (ROMM) is prohibited.
XXXXXXX1B
1213 11 10 9 8
15
14
W
X
W
00006F
H
MI
Reset value
bit8
MI ROM mirroring function select bit
0 ROM mirroring function disabled
1 ROM mirroring function enabled
Address
: Write only
: Indeterminate
: Undefined
: Reset value
Table 23.2-1 Functions of ROM Mirroring Function Select Register (ROMM)
Bit Name Function
bit8 MI:
ROM mirroring
function select bit
This bit enables or disables the ROM mirroring function.
When set to 0: Disables ROM mirroring function
When set to 1: Enables ROM mirroring function
• When the ROM mirroring function is enabled (MI = 1), data
at ROM addresses "FF8000
H
" to "FFFFFF
H
" can be read by
accessing addresses "008000
H
" to "00FFFF
H
".
bit9
to
bit15
Undefined bits Read: Value is undefined.
Write: No effect