Freescale Semiconductor, Inc.
Operating Modes and Resource Mapping
Internal Resource Mapping
5.5.1 Register Block Mapping
After reset the 512 byte register block resides at location $0000 but can
be reassigned to any 2K byte boundary within the standard 64K byte
address space. Mapping of internal registers is controlled by five bits in
the INITRG register. The register block occupies the first 512 bytes of the
2K byte block.
Bit 7
REG15
0
6
REG14
0
5
REG13
0
4
REG12
0
3
REG11
0
2
0
0
1
0
0
Bit 0
MMSWAI
0
RESET:
INITRG — Initialization of Internal Register Position Register
$0011
REG[15:11] — Internal register map position
These bits specify the upper five bits of the 16-bit registers address.
Normal modes: write once; special modes: write anytime. Read
anytime.
MMSWAI — Memory Mapping Interface Stop in Wait Control
This bit controls access to the memory mapping interface when in
Wait mode.
Normal modes: write anytime; special modes: write never. Read
anytime.
0 = Memory mapping interface continues to function during Wait
mode.
1 = Memory mapping interface access is shut down during Wait
mode.
68HC(9)12D60 — Rev 4.0
MOTOROLA
Advance Information
Operating Modes and Resource Mapping
81
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