MC912DG128ACPVE Datasheet, PDF (91/478 Pages) Freescale Semiconductor, Inc – Upward compatible with M68HC11 instruction set

Freescale Semiconductor, Inc.
Resource Mapping
Internal Resource Mapping
6.3.3 EEPROM Mapping
The MC68HC912DT128A has 2K bytes of EEPROM which is activated
by the EEON bit in the INITEE register. Mapping of internal EEPROM is
controlled by four bits in the INITEE register. After reset EEPROM
address space begins at location $0800 but can be mapped to any 4K
byte boundary within the standard 64K byte address space. The
EEPROM block occupies the last 2K bytes of the 4K byte block.
INITEE— Initialization of Internal EEPROM Position Register
$0012
Bit 7
6
5
4
3
2
1
Bit 0
EE15
EE14
EE13
EE12
0
0
0
EEON
RESET:
0
0
0
0
0
0
0
1
EE[15:12] — Internal EEPROM map position
These bits specify the upper four bits of the 16-bit EEPROM address.
Normal modes: write once; special modes: write anytime. Read
anytime.
EEON — internal EEPROM On (Enabled)
Read or write anytime.
0 = Removes the EEPROM from the map.
1 = Places the on-chip EEPROM in the memory map at the
address selected by EE[15:12].
MC68HC912DT128A — Rev 4.0
MOTOROLA
Resource Mapping
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Technical Data
91