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Rev.1.02 Jul 01, 2005 page 12 of 314
REJ09B0126-0102
M16C/6N Group (M16C/6NL, M16C/6NN) 3. Memory
Under development
This document is under development and its contents are subject to change.
3. Memory
Figure 3.1 shows a memory map of the M16C/6N Group (M16C/6NL, M16C/6NN). The address space
extends the 1 Mbyte from address 00000h to FFFFFh.
The internal ROM is allocated in a lower address direction beginning with address FFFFFh. For example, a
512-Kbyte internal ROM is allocated to the addresses from 80000h to FFFFFh.
As for the flash memory version, 4-Kbyte space (block A) exists in 0F000h to 0FFFFh. 4-Kbyte space is
mainly for storing data. In addition to storing data, 4-Kbyte space also can store programs.
The fixed interrupt vector table is allocated to the addresses from FFFDCh to FFFFFh. Therefore, store the
start address of each interrupt routine here.
The internal RAM is allocated in an upper address direction beginning with address 00400h. For example, a
31-Kbyte internal RAM is allocated to the addresses from 00400h to 07FFFh. In addition to storing data, the
internal RAM also stores the stack used when calling subroutines and when interrupts are generated.
The SFR is allocated to the addresses from 00000h to 003FFh. Peripheral function control registers are
located here. Of the SFR, any area which has no functions allocated is reserved for future use and cannot be
used by users.
The special page vector table is allocated to the addresses from FFE00h to FFFDBh. This vector is used by
the JMPS or JSRS instruction. For details, refer to M16C/60 and M16C/20 Series Software Manual.
Figure 3.1 Memory Map
00000h
YYYYY
h
FFFFFh
00400h
0FFFFh
10000h
0F000h
XXXXX
h
Internal ROM
(data area)
(1)
Internal ROM
(program area)
(3)
SFR
Internal RAM
Reserved area
FFE00h
FFFDCh
FFFFFh
NOTES:
1. As for the flash memory version, 4-Kbyte space (block A) exists.
2. Shown here is a memory map for the case where the PM13 bit in the PM1 register is "1".
If the PM13 bit is set to "0", 15 Kbytes of the internal RAM and 192 Kbytes of the internal ROM can be used.
3. When using the masked ROM version, write nothing to internal ROM area.
Undefined instruction
Overflow
BRK instruction
Address match
Single step
Oscillation stop and re-oscillation
detection / watchdog timer
Reset
Special page
vector table
DBC
NMI
Address XXXXX
h
Capacity
Internal RAM
20 Kbytes
31 Kbytes
053FF
h
16 Kbytes 043FF
h
07FFF
h
Address YYYYY
h
Capacity
Internal ROM
(1)
384 Kbytes A0000
h
256 Kbytes C0000
h
192 Kbytes D0000
h
512 Kbytes 80000
h
Reserved area