MC68HC912B32 Datasheet, PDF (31/128 Pages) Motorola, Inc – 16-Bit Microcontroller

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
5.4 Memory Maps
The following diagrams illustrate the memory map for each mode of operation immediately after reset.
$0000
$0800
$0D00
$8000
$0000 _REGISTERS
512 BYTES RAM
$01FF ^{MAP TO ANY 2K SPACE}
$0200 _{REGISTER FOLLOWING}
SPACE
$03FF ^{512 BYTES RAM}
$0800
1-KBYTE RAM
$0BFF ^{MAP TO ANY 2K SPACE}
$0D00
768 BYTES EEPROM
MAP TO ANY 4K SPACE
$0FFF
$0000
$7FFF
$8000
$F000
$FF00
$FFC0
$FFFF
VECTORS
EXPANDED
FLASH EEPROM
MAP WITH MAPROM BIT
IN MISC REGISTER
TO $0000 – $7FFF
OR $8000 – $FFFF
VECTORS
SINGLE CHIP
NORMAL
VECTORS
SINGLE CHIP
SPECIAL
$FF00
BDM
(IF ACTIVE)
$FFFF
Figure 6 MC68HC912B32 Memory Map
$FFFF
HC812B32 MEM MAP
MC68HC912B32
MC68HC912B32TS/D
MOTOROLA
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