Datasheet
R8C/32C Group 3. Memory
R01DS0009EJ0100 Rev 1.00 Page 13 of 52
Aug. 24, 2010
3. Memory
3.1 R8C/32C Group
Figure 3.1 is a Memory Map of R8C/32C Group. The R8C/32C 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 16-Kbyte internal ROM area is allocated addresses 0C000h 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 ROM (data flash) is allocated addresses 03000h to 03FFFh.
The internal RAM is allocated higher addresses, beginning with address 00400h. For example, a 1.5-Kbyte internal
RAM area is allocated addresses 00400h to 009FFh. 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. Peripheral
function control registers are allocated here. All unallocated spaces within the SFRs are reserved and cannot be
accessed by users.
Figure 3.1 Memory Map of R8C/32C Group
0FFFFh
0FFDCh
Notes:
1. Data flash indicates block A (1 Kbyte), block B (1 Kbyte), block C (1 Kbyte), and block D (1 Kbyte).
2. The blank areas are reserved and cannot be accessed by users.
FFFFFh
0FFFFh
0YYYYh
0XXXXh
00400h
002FFh
00000h
Internal ROM
(program ROM)
Internal RAM
SFR
(Refer to 4. Special
Function Registers
(SFRs))
02FFFh
02C00h
SFR
(Refer to 4. Special Function
Registers (SFRs))
ZZZZZh
Internal ROM
(program ROM)
03FFFh
03000h
Internal ROM
(data flash)
(1)
0FFD8h
Reserved area
Undefined instruction
Overflow
BRK instruction
Address match
Single step
Watchdog timer, oscillation stop detection, voltage monitor
(Reserved)
(Reserved)
Reset
Part Number
R5F21321CNFP, R5F21321CDFP
R5F21322CNFP, R5F21322CDFP
R5F21324CNFP, R5F21324CDFP
Internal ROM Internal RAM
Size Address 0YYYYh Size Address 0XXXXh
Address ZZZZZh
4 Kbytes
8 Kbytes
16 Kbytes
0F000h
0E000h
0C000h
512 bytes
1 Kbyte
1.5 Kbytes
005FFh
007FFh
009FFh
−
−
−