Memory; R8C/18 Group - Renesas M16C FAMILY Hardware Manual

R8C/18 Group, R8C/19 Group
3.

Memory

3.1

R8C/18 Group

Figure 3.1 is a Memory Map of R8C/18 Group. The R8C/18 Group has 1 Mbyte of address space from
addresses 00000h to FFFFFh.
The internal ROM area is allocated lower addresses, beginning with address 0FFFFh. For example, a
16-Kbyte internal ROM is allocated addresses 0C000h to 0FFFFh.
The fixed interrupt vector table is allocated addresses 0FFDCh to 0FFFFh. They store the starting
address of each interrupt routine.
The internal RAM is allocated higher addresses, beginning with address 00400h. For example, a 1-
Kbyte internal RAM area is allocated addresses 00400h to 007FFh. The internal RAM is used not only
for storing data but also for calling subroutines and as stacks when interrupt requests are
acknowledged.
Special function registers (SFRs) are allocated addresses 00000h to 002FFh. The peripheral function
control registers are allocated here. All addresses within the SFR, which have nothing allocated are
reserved for future use and cannot be accessed by users.
00000h
002FFh
00400h
0XXXXh
0YYYYh
0FFFFh
FFFFFh
NOTE:
R5F21184SP, R5F21184DSP, R5F21184DD, R5F21184NP
R5F21183SP, R5F21183DSP, R5F21183DD, R5F21183NP
R5F21182SP, R5F21182DSP, R5F21182DD, R5F21182NP
R5F21181SP, R5F21181DSP, R5F21181DD
Figure 3.1 Memory Map of R8C/18 Group
Rev.1.30 Apr 14, 2006
REJ09B0222-0130
SFR
(See 4. Special Function
Registers (SFRs))
Internal RAM
Internal ROM
Expanded area
1. The blank regions are reserved. Do not access locations in these regions.
Part Number
Page 16 of 233
0FFDCh
Undefined instruction
BRK instruction
Address match
Watchdog timer oscillation stop detection
•
Address break
0FFFFh
Internal ROM
Size Address 0YYYYh
16 Kbytes 0C000h
12 Kbytes 0D000h
8 Kbytes 0E000h
4 Kbytes 0F000h
3. Memory
Overflow
Single step
voltage monitor 2
•
(Reserved)
Reset
Internal RAM
Size Address 0XXXXh
1 Kbyte 007FFh
768 bytes 006FFh
512 bytes 005FFh
384 bytes 0057Fh