RX230 Datasheet, PDF (40/177 Pages) Renesas Technology Corp – 54-MHz 32-bit RX MCUs, built-in FPU, 88.56 DMIPS, up to 512-KB flash memory

RX230 Group, RX231 Group
3. Address Space
3.2 External Address Space
The external address space is divided into up to four CS areas (CS0 to CS3), each corresponding to the CSn# signal
output from a CSn# (n = 0 to 3) pin. Figure 3.2 shows the address ranges corresponding to the individual CS areas (CS0
to CS3) in on-chip ROM disabled extended mode.
0000 0000h
0001 0000h
0008 0000h
0010 0000h
RAM
Reserved area*¹
Peripheral I/O registers
Reserved area*¹
0500 0000h
External address space
(CS area)
0800 0000h
0500 0000h
05FF FFFFh
0600 0000h
06FF FFFFh
0700 0000h
07FF FFFFh
CS3 (16 Mbytes)
CS2 (16 Mbytes)
CS1 (16 Mbytes)
Reserved area*¹
FF00 0000h
FFFF FFFFh
External address space*²
(CS area)
FF00 0000h
FFFF FFFFh
CS0 (16 Mbytes)
Note 1. Reserved areas should not be accessed.
Note 2. The CS0 area is disabled in on-chip ROM enabled extended mode.
In this mode, the address space for addresses above 1000 0000h is as shown in figure on this
section, Memory Map in Each Operating Mode.
Figure 3.2
Correspondence between External Address Spaces and CS Areas
(In On-Chip ROM Disabled Extended Mode)
R01DS0261EJ0110 Rev.1.10
Oct 30, 2015
Page 40 of 177