XC886/888CLM
Memory Organization
User’s Manual
3-2
V1.3, 2010-02
Memory Organization, V 1.2
illustrates the memory address spaces of the 32-Kbyte ROM devices. For the
24-Kbyte ROM devices, the shaded address regions are not available.
For both 24-Kbyte and 32-Kbyte ROM devices, the last four bytes of the ROM from
7FFC
H
to 7FFF
H
are reserved for the ROM signature and cannot be used to store user
code or data. Therefore, even though the ROM device contains either a 24-Kbyte or 32-
Kbyte ROM, the maximum size of code that can be placed in the ROM is the given size
less four bytes.
Figure 3-2
Memory Map of XC886/888 ROM Device
Special Function
Registers
Indirect
Address
Direct
Address
80
H
FF
H
00
H
Program Space
External Data Space
Internal Data Space
Internal RAM
7F
H
Internal RAM
0000
H
F000
H
C000
H
F600
H
FFFF
H
7000
H
8000
H
Boot ROM
12 Kbytes
XRAM
1.5 Kbytes
F000
H
F600
H
0000
H
FFFF
H
XRAM
1.5 Kbytes
A000
H
B000
H
D-Flash Bank
4 Kbytes
5000
H
ROM
32 Kbytes
*