Datasheet
R8C/24 Group, R8C/25 Group 3. Memory
Rev.3.00 Feb 29, 2008 Page 16 of 51
REJ03B0117-0300
3. Memory
3.1 R8C/24 Group
Figure 3.1 is a Memory Map of R8C/24 Group. The R8C/24 group has 1 Mbyte of address space from addresses
00000h to FFFFFh.
The internal ROM is allocated lower addresses, beginning with address 0FFFFh. For example, a 48-Kbyte internal
ROM area is allocated addresses 04000h 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 2-Kbyte internal
RAM area is allocated addresses 00400h to 00BFFh. 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.
Figure 3.1 Memory Map of R8C/24 Group
Undefined instruction
Overflow
BRK instruction
Address match
Single step
Watchdog timer/oscillation stop detection/voltage monitor
(Reserved)
(Reserved)
Reset
Part Number
Internal ROM Internal RAM
Size Address 0YYYYh
R5F21244SNFP, R5F21244SNXXXFP,
R5F21244SDFP, R5F21244SDXXXFP,
R5F21244SNLG, R5F21244SNXXXLG
R5F21245SNFP, R5F21245SNXXXFP,
R5F21245SDFP, R5F21245SDXXXFP
R5F21246SNFP, R5F21246SNXXXFP,
R5F21246SDFP, R5F21246SDXXXFP,
R5F21246SNLG, R5F21246SNXXXLG
R5F21247SNFP, R5F21247SNXXXFP,
R5F21247SDFP, R5F21247SDXXXFP
R5F21248SNFP, R5F21248SNXXXFP,
R5F21248SDFP, R5F21248SDXXXFP
16 Kbytes
24 Kbytes
32 Kbytes
48 Kbytes
64 Kbytes
−
−
−
−
13FFFh
007FFh
00BFFh
00BFFh
00DFFh
00FFFh
00400h
002FFh
00000h
Internal RAM
SFR
(Refer to 4. Special
Function Registers
(SFRs))
0FFFFh
0FFDCh
Address 0XXXXh
NOTE:
1. The blank regions are reserved. Do not access locations in these regions.
Address 1ZZZZh Size
1 Kbyte
2 Kbytes
2 Kbytes
2.5 Kbytes
3 Kbytes
0C000h
0A000h
08000h
04000h
04000h
FFFFFh
0FFFFh
0YYYYh
Internal ROM
(program ROM)
Internal ROM
(program ROM)
1ZZZZh
0XXXh