MC68HC912BD32 Datasheet, PDF (55/292 Pages) Freescale Semiconductor, Inc – Advance Information

Freescale Semiconductor, Inc.
Operating Modes and Resource Mapping
Internal Resource Mapping
Write once in normal modes or anytime in special modes. Read
anytime.
EEPROM Mapping
The MC68HC912BD32 has 768 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 $0D00
but can be mapped to any 4K byte boundary within the standard
64K byte address space.
INITEE— Initialization of Internal EEPROM Position Register
Bit 7
6
5
4
3
2
EE15
EE14
EE13
EE12
0
0
RESET:
0
0
0
0
0
0
$0012
1
Bit 0
0
EEON
0
1
EE[15:12] — Internal EEPROM map position
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.
EEON — Internal EEPROM On (Enabled)
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.
0 = Removes the EEPROM from the map
1 = Places the on-chip EEPROM in the memory map
Flash EEPROM and
Expansion
Address Mapping
Additional mapping controls are available that can be used in
conjunction with Flash EEPROM and memory expansion.
The 32K byte Flash EEPROM can be mapped to either the upper or
lower half of the 64K byte address space. When mapping conflicts
occur, registers, RAM and EEPROM have priority over Flash EEPROM.
To use memory expansion the part must be operated in one of the
expanded modes.
9-mode
Operating Modes and Resource Mapping
For More Information On This Product,
Go to: www.freescale.com
MC68HC912BD32 Rev 1.0