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3. Memory
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3. Memory
Figure 3.1 shows a memory map of the M32C/85 group (M32C/85, M32C/85T).
The M32C/85 group (M32C/85, M32C/85T) provides 16-Mbyte address space from addresses 00000016 to
FFFFFF16.
The internal ROM is allocated lower addresses beginning with address FFFFFF16. For example, a 64-
Kbyte internal ROM is allocated addresses FF000016 to FFFFFF16.
The fixed interrupt vectors are allocated addresses FFFFDC16 to FFFFFF16. It stores the starting address
of each interrupt routine.
The internal RAM is allocated higher addresses beginning with address 00040016. For example, a 10-
Kbyte internal RAM is allocated addresses 00040016 to 002BFF16. Besides storing data, it becomes stacks
when the subroutine is called or an interrupt is acknowledged.
SFR, consisting of control registers for peripheral functions such as I/O port, A/D converter, serial I/O,
timers, is allocated addresses 00000016 to 0003FF16. All blank spaces within SFR are reserved and cannot
be accessed by users.
The special page vectors are allocated addresses FFFE0016 to FFFFDB16. It is used for the JMPS instruc-
tion and JSRS instruction. Refer to the Renesas publication M32C/80 Series Software Manual for details.
In memory expansion mode and microprocessor mode, some spaces are reserved and cannot be ac-
cessed by users.
SFR
Internal RAM
Reserved Space
External Space(1)
BRK Instruction
Overflow
Undefined Instruction
FFFFFF16
NMI
00000016
00040016
XXXXXX16
00F00016
00FFFF16
F0000016
YYYYYY16
FFFFFF16
Reserved Space(2)
Internal ROM(4)
Special Page
Vector Table
Address Match
Watchdog Timer(5)
Reset
NOTES:
1. In memory expansion and microprocessor modes.
2. In memory expansion mode.
This space becomes external space in microprocessor mode.
3. Additional 4-Kbyte space is provided in the flash memory version for storing data.
This space can be used in single-chip mode and memory expansion mode.
This space becomes reserved space in microprocessor mode.
4. This space can be used in single-chip mode and memory expansion mode.
This space becomes external space in microprocessor mode.
5. Watchdog timer interrupt, oscillation stop detection interrupt, and low voltage detection
interrupt share vectors.
FFFFDC16
FFFE0016
Internal ROM
(3)
(Data space)
Internal ROM
Capacity
320 Kbytes
384 Kbytes
512 Kbytes
YYYYYY16
FB000016
FA000016
F8000016
Internal RAM
Capacity
24 Kbytes
XXXXXX16
0063FF16
Figure 3.1 Memory Map