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R01UH0092EJ0110 Rev.1.10
Page 158 of 807
Jul 31, 2012
M16C/64C Group
12. Memory Space Expansion Function
12.3.2
4-MB Mode
In 4-MB mode, the memory space is 4 MB. Bits BSR2 to BSR0 in the DBR register select the bank
number to be accessed to read or write data. Setting the OFS bit to 1 (offset) allows the accessed
address to be offset by 40000h.
In 4-MB mode, the
CSi
pin function differs depending on the area to be accessed.
12.3.2.1
Addresses 04000h to 3FFFFh, C0000h to FFFFFh
•
The
CSi
signal is output from the
CSi
pin (same operation as 1-MB mode, except the last address
of the
CS1
area is up to 3FFFFh).
12.3.2.2
Addresses 40000h to BFFFFh
•
The
CS0
pin outputs a low-level signal.
•
Pins
CS3
to
CS1
output the setting values of bits BSR2 to BSR0 (bank number).
Figure 12.3 and Figure 12.4 show the memory mapping and
CS
areas in 4-MB mode.
Note that banks 0 to 6 are data-only areas. Place programs in bank 7 or the
CSi
area.
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