
Technical Data
M68HC11K Family
86
Operating Modes and On-Chip Memory
MOTOROLA
Operating Modes and On-Chip Memory
Since the direct addressing mode accesses RAM more quickly and
efficiently than other addressing modes, many applications will find the
default locations of registers and on-board RAM at the bottom of
memory to be the most advantageous.
When RAM and the registers are both mapped to different 4-K
boundaries, the registers are mapped at $x000–$x07F, and RAM is
moved to $x000–$x2FF ($x000–x3FF for the [7]11KS2).
Table 4-6. Register Mapping
REG[3:0]
Address
0000
$0000–$007F(1)
1. Default locations out of reset.
0001
$1000–$107F
0010
$2000–$207F
0011
$3000–$307F
0100
$4000–$407F
0101
$5000–$507F
0110
$6000–$607F
0111
$7000–$707F
1000
$8000–$807F
1001
$9000–$907F
1010
$A000–$A07F
1011
$B000–$B07F
1100
$C000–$C07F
1101
$D000–$D07F
1110
$E000–$E07F
1111
$F000–$F07F