M16C65 Datasheet, PDF (217/829 Pages) Renesas Technology Corp – RENESAS MCU M16C FAMILY / M16C/60

Under development
M16C/65 Group
Preliminary Specification
This is a preliminary specification and is subject to change.
12. Memory Space Expansion Function
Note
Do not use this function for the 80-pin package.
12. Memory Space Expansion Function
12.1 Introduction
The following describes the memory space expansion function. In memory expansion or microprocessor
mode, the memory space expansion function allows the access space to be expanded. Table 12.1 lists
Specifications of Memory Space Expansion Function. In this chapter, the space for the external devices
accessed by the CSi (i = 0 to 3) signal is referred to as the CSi area.
Table 12.1 Specifications of Memory Space Expansion Function
Item
1-Mbyte mode
4-Mbyte mode
i = 0 to 3
Specifications
• Memory space 1 Mbyte (no expansion)
• Specify the space for the external devices accessed by the CSi signal.
• Memory space 4 Mbytes
• Select bank numbers to access to data.
• Allows the accessed address to be offset by 40000h
• The CSi pin function differs depending on the area to be accessed.
12.2 Registers
Table 12.2 lists registers related to the memory expansion function. Refer to 10. “Processor Mode” for the
PM1 register.
Table 12.2
Address
0005h
000Bh
Register Structure
Register Name
Processor Mode Register 1
Data Bank Register
Register Symbol
After Reset
PM1
0000 1000b
DBR
00h
REJ09B0484-0030 Rev.0.30 Sep 09, 2008
Page 182 of 791