OPERATING MODES AND ON-CHIP MEMORY
TECHNICAL DATA
4-3
4.2 Memory Map
The operating mode determines memory mapping and whether memory is addressed
on- or off-chip. Refer to Figure 4-2, which illustrates the memory maps for each of the
four modes of operation. Memory locations for on-chip resources are the same for both
expanded multiplexed and single-chip modes. 192-byte RAM is mapped to $0040 af-
ter reset. It can be placed at any other 4K boundary ($x040) by writing an appropriate
value to the INIT register. The 64-byte register block is mapped to $0000 after reset
and can also be placed at any 4K boundary ($x000) by writing an appropriate value to
the INIT register. Refer to Table 4-1, which details the MCU register and control bit
assignments.
Figure 4-2 MC68HC11D3 Memory Map
SINGLE
CHIP
BOOTSTRAP
SPECIAL
TEST
EXPANDED
NORMAL
MODES
INTERRUPT
VECTORS
192 BYTES STATIC RAM
64-BYTE REGISTER BLOCK
$0000
$0040
$7000
$F000
$FFFF
SPECIAL MODES
INTERRUPT
VECTORS
4 KBYTES ROM
BOOT
ROM
D3 MEM MAP
FFC0
FFFF
BFC0
BFFF
FFFF
BF00
BFFF
7000
7FFF
0040
00FF
0000
003F
EXT
F000
FFFF
EXT
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Freescale Semiconductor, Inc.
For More Information On This Product,
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