MC68HC912B32MFU8 MOTOROLA [Motorola, Inc], MC68HC912B32MFU8 Datasheet - Page 29

• Manufacturer Part Number: MC68HC912B32MFU8
• Description: 16-Bit Microcontroller
• Manufacturer: MOTOROLA [Motorola, Inc]

MMSWAI — Memory Mapping Interface Stop in Wait Control
5.3.2 RAM Mapping
INITRM — Initialization of Internal RAM Position Register
RAM[15:11] — Internal RAM Map Position
5.3.3 EEPROM Mapping
INITEE — Initialization of Internal EEPROM Position Register
EE[15:12] — Internal EEPROM map position
EEON — Internal EEPROM On (Enabled)
5.3.4 Flash EEPROM and Expansion Address Mapping
MC68HC912B32
MC68HC912B32TS/D
RESET:
RESET:
This bit controls access to the memory mapping interface when in Wait mode.
The MC68HC912B32 has 1 Kbyte 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 2-Kbyte boundary within the standard 64-Kbyte address space. Mapping of in-
ternal RAM is controlled by five bits in the INITRM register. The RAM array occupies the first 1 Kbyte
of the 2-Kbyte block.
These bits specify the upper five bits of the 16-bit RAM address.
Write once in normal modes or anytime in special modes. Read anytime.
The MC68HC912B32 has 768 bytes of EEPROM which is activated by the EEON bit in the INITEE reg-
ister.
Mapping of internal EEPROM is controlled by four bits in the INITEE register. After reset EEPROM ad-
dress space begins at location $0D00 but can be mapped to any 4-Kbyte boundary within the standard
64-Kbyte address space.
These bits specify the upper four bits of the 16-bit EEPROM address.
Write once in normal modes or anytime in special modes. Read anytime.
The EEON bit allows read access to the EEPROM array. EEPROM control registers can be accessed
and EEPROM locations may be programmed or erased regardless of the state of EEON.
This bit is forced to one in single-chip modes. Read or write anytime.
Additional mapping controls are available that can be used in conjunction with Flash EEPROM and
memory expansion.
0 = Memory mapping interface continues to function during Wait mode.
1 = Memory mapping interface access is shut down during Wait mode.
0 = Removes the EEPROM from the map
1 = Places the on-chip EEPROM in the memory map
RAM15
EE15
Bit 7
Bit 7
0
0
RAM14
EE14
6
0
6
0
RAM13
EE13
5
0
5
0
RAM12
EE12
4
0
4
0
RAM11
3
1
3
0
0
2
0
0
2
0
0
1
0
0
1
0
0
EEON
Bit 0
Bit 0
0
0
1
MOTOROLA
$0010
$0012
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