Datasheet
R8C/33T Group 3. Memory
R01DS0046EJ0110 Rev.1.10 Page 12 of 47
Apr 26, 2011
3. Memory
3.1 R8C/33T Group
Figure 3.1 is a Memory Map of R8C/33T Group. The R8C/33T Group has a 1-Mbyte address space from addresses
00000h to FFFFFh. For example, a 32-Kbyte internal ROM area is allocated addresses 08000h 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 2.5-Kbyte internal
RAM area is allocated addresses 00400h to 00DFFh. 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/33T 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
Address break
(Reserved)
Reset
Part Number
R5F21334TNFP, R5F21334TDFP,
R5F21334TNXXXFP, R5F21334TDXXXFP
R5F21335TNFP, R5F21335TDFP,
R5F21335TNXXXFP, R5F21335TDXXXFP
R5F21336TNFP, R5F21336TDFP,
R5F21336TNXXXFP, R5F21336TDXXXFP
Size Address 0YYYYh
16 Kbytes
24 Kbytes
32 Kbytes
0C000h
0A000h
08000h
Internal ROM
Address ZZZZZh
—
—
—
Address 0XXXXhSize
1.5 Kbytes
2 Kbytes
2.5 Kbytes
009FFh
00BFFh
00DFFh
Internal RAM