Datasheet

M32C/87 Group (M32C/87, M32C/87A, M32C/87B) 3. Memory
REJ03B0127-0151 Rev.1.51 Jul 31, 2008
Page 26 of 85
3. Memory
Figure 3.1 shows a memory map of the M32C/87 Group (M32C/87, M32C/87A, M32C/87B).
The M32C/87 Group (M32C/87, M32C/87A, M32C/87B) has 16-Mbyte address space from addresses 000000h to
FFFFFFh.
The internal ROM is allocated in lower addresses, beginning with address FFFFFFh. For example, a 512-Kbyte
internal ROM area is allocated in addresses F80000h to FFFFFFh.
The fixed interrupt vectors are allocated in addresses FFFFDCh to FFFFFFh. They store the starting address of each
interrupt routine.
The internal RAM is allocated higher addresses, beginning with address 000400h. For example, a 48-Kbyte internal
RAM area is allocated in addresses 000400h to 00C3FFh. The internal RAM is used not only for storing data but for
the stacks when subroutines are called or when interrupt requests are acknowledged.
SFRs are allocated in addresses 000000h to 0003FFh. The peripheral function control registers such as for I/O ports,
A/D converters, serial interfaces, timers are allocated here. All blank spaces within SFRs are reserved and cannot be
accessed by users.
The special page vectors are allocated addresses FFFE00h to FFFFDBh. They are used for the JMPS instruction and
JSRS instruction. Refer to the Renesas publication M32C/80 Series Software Manual for details.
Figure 3.1 Memory Map
NOTES:
1. The space is used as the external space in memory expansion mode and in microprocessor mode. It is reserved in
single-ship mode.
2. The space is reserved in memory expansion mode. It is used as the external space in microprocessor mode.
3. Additional 4-Kbyte space is provided in the flash memory version to store data. This space is used in single-chip
mode and memory expansion mode. It is reserved in microprocessor mode.
4. This space is used in single-chip mode and memory expansion mode. It is used as the external space in
microprocessor mode.
5. The watchdog timer interrupt, oscillation stop detection interrupt, and Vdet4 detection interrupt use the same vector.
000000h
000400h
XXXXXXh
00F000h
F00000h
YYYYYYh
FFFFFFh
FFFFFFh
FFFFDCh
FFFE00h
00FFFFh
Capacity XXXXXXh
0063FFh
Internal RAM
24 Kbytes
Reset
Watchdog timer (5)
Address match
BRK instruction
Overflow
Undefined instruction
Special page
vector table
SFR
Internal RAM
Reserved
External space
(1)
Reserved
(2)
Internal ROM
(4)
Internal ROM
(3)
(Data space)
NMI
Capacity YYYYYYh
FA0000h
Internal ROM
384 Kbytes
007FFFh31 Kbytes
00C3FFh48 Kbytes
F80000h512 Kbytes
F40000h768 Kbytes
F00000h1024 Kbytes