MC68HC11KW1 Datasheet, PDF (58/238 Pages) Motorola, Inc – High-density complementary metal oxide semiconductor HCMOS) microcontroller unit

Table 4-5 RAM and register remapping
RAM[3:0] Location
REG[3:0] Location
0000 $0000–$02FF
0000 $0000–$009F
0001 $1000–$12FF
0001 $1000–$109F
0010 $2000–$22FF
0010 $2000–$209F
0011 $3000–$32FF
0011 $3000–$309F
4
0100 $4000–$42FF
0101 $5000–$52FF
0100 $4000–$409F
0101 $5000–$509F
0110 $6000–$62FF
0110 $6000–$609F
0111 $7000–$72FF
0111 $7000–$709F
1000 $8000–$82FF
1000 $8000–$809F
1001 $9000–$92FF
1001 $9000–$909F
1010 $A000–$A2FF
1010 $A000–$A09F
1011 $B000–$B2FF
1011 $B000–$B09F
1100 $C000–$C2FF
1100 $C000–$C09F
1101 $D000–$D2FF
1101 $D000–$D09F
1110 $E000–$E2FF
1110 $E000–$E09F
1111 $F000–$F2FF
1111 $F000–$F09F
When the memory map has the 160-byte register block mapped at the same location as RAM, the
registers have priority and the RAM is relocated to the memory space immediately following the
register block. This mapping feature keeps all the RAM available for use. Refer to Figure 4-2,
which illustrates the overlap.
$x000
$x09F
$x0A0
RAM A
$x000
$x09F
Register block
$x0A0
RAM B
RAM B
$x2FF
$x2FF
$x300
$x39F
RAM A
Register and RAM mapped
to different 4K boundaries.
Register and RAM mapped
to the same 4K boundary.
Figure 4-2 RAM and register overlap
4-14
OPERATING MODES AND ON-CHIP MEMORY
MC68HC11KW1