MC68HC912BD32 Datasheet, PDF (54/292 Pages) Freescale Semiconductor, Inc – Advance Information

Freescale Semiconductor, Inc.
Operating Modes and Resource Mapping
the INITRG register. The register block occupies the first 512 bytes of
the 2K byte block.
INITRG — Initialization of Internal Register Position Register
Bit 7
6
5
4
3
2
REG15 REG14 REG13 REG12 REG11
0
RESET:
0
0
0
0
0
0
$0011
1
Bit 0
0
MMSWAI
0
0
REG[15:11] — Internal register map position
These bits specify the upper five bits of the 16-bit registers address.
Write once in normal modes or anytime in special modes. Read
anytime.
MMSWAI — Memory Mapping Interface Stop in Wait Control
This bit controls access to the memory mapping interface when in
Wait mode.
0 = Memory mapping interface continues to function during Wait
mode.
1 = Memory mapping interface access is shut down during Wait
mode.
RAM Mapping
The MC68HC912BD32 has 1K byte of fully static RAM that is used for
storing instructions, variables, and temporary data during program
execution. After reset, RAM addressing begins at location $0800 but can
be assigned to any 2K byte boundary within the standard 64K byte
address space. Mapping of internal RAM is controlled by five bits in the
INITRM register. The RAM array occupies the first 1K byte of the
2K byte block.
NITRM — Initialization of Internal RAM Position Register
Bit 7
6
5
4
3
2
RAM15 RAM14 RAM13 RAM12 RAM11
0
RESET:
0
0
0
0
1
0
$0010
1
Bit 0
0
0
0
0
RAM[15:11] — Internal RAM map position
These bits specify the upper five bits of the 16-bit RAM address.
MC68HC912BD32 Rev 1.0
Operating Modes and Resource Mapping
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8-mode