mc68hc912bd32 Freescale Semiconductor, Inc, mc68hc912bd32 Datasheet - Page 54

• Manufacturer Part Number: mc68hc912bd32
• Description: 16-bit Device Composed Of Standard On-chip Peripherals
• Manufacturer: Freescale Semiconductor, Inc

INITRG — Initialization of Internal Register Position Register
NITRM — Initialization of Internal RAM Position Register
Operating Modes and Resource Mapping
MC68HC912BD32 Rev 1.0
RESET:
RESET:
REG15
RAM15
Bit 7
Bit 7
0
0
REG14
RAM14
the INITRG register. The register block occupies the first 512 bytes of
the 2K byte block.
REG[15:11] — Internal register map position
MMSWAI — Memory Mapping Interface Stop in Wait Control
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.
RAM[15:11] — Internal RAM map position
6
0
6
0
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.
This bit controls access to the memory mapping interface when in
Wait mode.
These bits specify the upper five bits of the 16-bit RAM address.
Freescale Semiconductor, Inc.
For More Information On This Product,
0 = Memory mapping interface continues to function during Wait
1 = Memory mapping interface access is shut down during Wait
Operating Modes and Resource Mapping
mode.
mode.
REG13
RAM13
5
0
5
0
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REG12
RAM12
4
0
4
0
REG11
RAM11
3
0
3
1
2
0
0
2
0
0
1
0
0
1
0
0
MMSWAI
Bit 0
Bit 0
$0011
$0010
0
0
0
8-mode