Panasonic F77G User Manual page 69

Memory Area Control Register (AREACTR)
7 6
AREACTR
CS8EXT CS7EXT CS6EXT CS5EXT CS4EXT CS3EXT CS2EXT CS1EXT
Figure 2-3-3
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.
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.
5 4 3 2
Memory Area Control Register (AREACTR : x'03F03', R/W)
1 0
( At reset : 1 1 1 1 1 1 1 1 )
Set always to "0"
CS1EXT
CS8 to 2EXT Internal memory / External memory selection
0 Internal memory
External memory
1
Chapter 2 CPU Basics
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II - 17
Bus Interface