Preliminary document
Specifications in this document are tentative and subject to change.
Under development
R8C/34W Group, R8C/34X Group, R8C/34Y Group, R8C/34Z Group
3. Memory
3.2
R8C/34X Group
Figure 3.2 is a Memory Map of R8C/34X Group. The R8C/34X Group has a 1-Mbyte address space from addresses
00000h to FFFFFh. The internal ROM (program 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. The starting address of each interrupt
routine is stored here.
The internal RAM is allocated higher addresses, beginning with address 00400h. For example, a 4-Kbyte internal
RAM area is allocated addresses 00400h to 013FFh. The internal RAM is used not only for data storage but also as
a stack area when a subroutine is called or when an interrupt request is acknowledged.
Special function registers (SFRs) are allocated addresses 00000h to 002FFh and 02C00h to 02FFFh (the SFR areas
for the CAN, DTC, and other modules). Peripheral function control registers are allocated here. All unallocated
spaces within the SFRs are reserved and cannot be accessed by users.
00000h
SFR
(Refer to 4. Special
Function Registers
(SFRs))
002FFh
00400h
Internal RAM
0XXXXh
(1)
02C00h
02FFFh
SFR
0FFDCh
Undefined instruction
Overflow
BRK instruction
Address match
(Refer to 4. Special Function
Registers (SFRs))
Single step
Watchdog timer, oscillation stop detection, voltage monitor
Address break
0YYYYh
0FFFFh
Internal ROM
(program ROM)
(Reserved)
Reset
0FFFFh
Internal ROM
(program ROM)
ZZZZZh
FFFFFh
Notes:
1. The SFR areas for the CAN, DTC and other modules are allocated to addresses 02C00h to 02FFFh.
2. The blank areas are reserved and cannot be accessed by users.
Internal ROM
Internal RAM
Address 0XXXXh
Part Number
Address ZZZZZh
Size
Address 0YYYYh
Size
R5F21346XJFP, R5F21346XKFP
R5F21347XJFP, R5F21347XKFP
R5F21348XJFP, R5F21348XKFP
R5F2134AXJFP, R5F2134AXKFP
R5F2134CXJFP, R5F2134CXKFP
32 Kbytes
48 Kbytes
64 Kbytes
96 Kbytes
128 Kbytes
08000h
04000h
04000h
04000h
04000h
2.5 Kbytes
4 Kbytes
6 Kbytes
8 Kbytes
10 Kbytes
00DFFh
013FFh
01BFFh
023FFh
02BFFh
13FFFh
1BFFFh
23FFFh
Figure 3.2
Memory Map of R8C/34X Group
REJ03B0312-0010 Rev.0.10
Apr 09, 2010
Page 24 of 67
RENESAS [ RENESAS TECHNOLOGY CORP ]
