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Chapter 2 CPU Basics
Bus Interface
Memory Area Control Register (AREACTR)
Figure 2-3-3 Memory Area Control Register (AREACTR : x'03F03', R/W)
The MN101CF77 contains internal memory in CSI area. Therefore, set the CS1EXT flag of the
memory area control register (AREACTR) to "0" . When CS1EXT flag is not set to "0", the data
cannot be accessed to 112KB (x'04000' to x'1FFFF' ) of internal ROM space.
In CS0 area, MMOD pin selects internal ROM/external memory. In CS9 area, only external memory can
be selected as internal memory is not available.
76543210
AREACTR
CS8EXT CS7EXTCS6EXT CS5EXTCS4EXT CS3EXTCS2EXT CS1EXT
( At reset : 1 1 1 1 1 1 1 1 )
CS8 to 2EXT
Internal memory / External memory selection
0
1
Internal memory
External memory
CS1EXT
Set always to "0"
Don't care