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CHAPTER 22 ROM MIRROR FUNCTION SELECTION MODULE
22.1 Overview of ROM Mirror Function Selection Module
The ROM mirror function selection module is set to read the ROM data arranged in FF
bank with access to 00 bank.
■
Block diagram of the ROM mirror function selection module
Figure 22.1-1 shows a block diagram of the ROM mirror function selection module.
■
Registers of the ROM mirror function selection module
The following diagram shows configuration of the ROM mirror function selection module.
ROM mirror function selection register (ROMM)
address: 00006F
(+): MB90F489B : Read only, fix to "1"
474
Figure 22.1-1 Block diagram of the ROM mirror function selection module
2
F
MC-16LX bus
bit
15
14
-
-
H
Other
: Selectable, initial value "0"
ROM mirror function selection
Address area
FF bank
ROM
13
12
11
10
-
-
-
-
00 bank
9
8
Initial value
MS
MI
- - - - - - (+)1
R/W
R/W
(+)
B
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