MB90480/485 Series
20. ROM Mirror Function Select Module
The ROM mirror function selection module sets the data in ROM assigned to FF bank so that the data is read
by access to 00 bank.
(1) Register List
• ROM mirror function select register (ROMM)
Initial value
15
14
13
12
11
10
9
8
Address : 00006FH
- : Not used
------+1B
⎯
⎯
⎯
⎯
⎯
⎯
MS
MI
R/W
R/W
( + ) : MB90F489B : Read only, fixed at “1”
Other : Selectable, Initial value 0
(+)
(2) Block Diagram
F2MC-16LX bus
ROM mirror function select
Address area
00 bank
FF bank
ROM
Note : Do not access ROM mirror function selection register (ROMM) on using the area of address 004000H to
00FFFFH (008000H to 00FFFFH) .
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