MC68HC912BD32 Datasheet, PDF (57/292 Pages) Freescale Semiconductor, Inc – Advance Information

Freescale Semiconductor, Inc.
Operating Modes and Resource Mapping
Memory Maps
Table 13 Expanded Stretch-Bit Definition
Stretch bit EXSTR1
0
0
1
1
Stretch bit EXSTR0
0
1
0
1
E Clocks Stretched
0
1
2
3
MAPROM — Map Location of Flash EEPROM
This bit determines the location of the on-chip Flash EEPROM. In
Expanded modes it is reset to zero. In Single Chip modes it is reset to
one. If ROMON is zero, this bit has no meaning or effect.
0 = Flash EEPROM is located from $0000 to $7FFF
1 = Flash EEPROM is located from $8000 to $FFFF
ROMON — Enable Flash EEPROM
In Expanded modes ROMON is reset to zero. In Single Chip modes it
is reset to one. If the internal RAM, registers, EEPROM, or BDM ROM
(if active) are mapped to the same space as the Flash EEPROM, they
will have priority over the Flash EEPROM.
0 = Disables the Flash EEPROM in the memory map
1 = Enables the Flash EEPROM in the memory map
Memory Maps
The following diagrams illustrate the memory map for each mode of
operation immediately after reset.
11-mode
Operating Modes and Resource Mapping
For More Information On This Product,
Go to: www.freescale.com
MC68HC912BD32 Rev 1.0