mc68hc912bc32 Freescale Semiconductor, Inc, mc68hc912bc32 Datasheet - Page 83

• Manufacturer Part Number: mc68hc912bc32
• Description: M68hc12 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

MAPROM — FLASH EEPROM/ROM Map Bit
ROMON — FLASH EEPROM/ROM Enable Bit
5.5 Memory Map
Figure 5-6
Freescale Semiconductor
This bit determines the location of the on-chip FLASH EEPROM/ROM. In expanded modes, it is reset
to 0. In single-chip modes, it is reset to 1. If ROMON is 0, this bit has no meaning or effect.
In expanded modes, ROMON is reset to 0. In single-chip modes, it is reset to 1. If the internal RAM,
registers, EEPROM, or BDM ROM (if active) are mapped to the same space as the FLASH
EEPROM/ROM, they will have priority over the FLASH EEPROM/ROM.
1 = FLASH EEPROM/ROM is located from $8000 to $FFFF.
0 = FLASH EEPROM/ROM is located from $0000 to $7FFF.
1 = Enables the FLASH EEPROM/ROM in the memory map
0 = Disables the FLASH EEPROM/ROM in the memory map
illustrates the memory map for each mode of operation immediately after reset.
$FFC0
$FFFF
$0D00
$F000
$FF00
$0000
$8000
$0800
EXPANDED
VECTORS
SINGLE-CHIP
NORMAL
VECTORS
M68HC12B Family Data Sheet, Rev. 9.1
Figure 5-6. Memory Map
SINGLE-CHIP
VECTORS
SPECIAL
$FF00
$FFFF
$0000
$01FF
$03FF
$0BFF
$0D00
$0FFF
$0200
$0800
REGISTERS
512 BYTES
MAP TO ANY 2-K SPACE
1-KBYTE RAM
MAP TO ANY 2-K SPACE
768 BYTES EEPROM
MAP TO ANY 4-K SPACE
REGISTER FOLLOWING
SPACE
512 BYTES
IF ACTIVE
MAP WITH MAPROM BIT
BDM
FLASH EEPROM/ROM
IN MISC REGISTER
OR $8000–$FFFF
TO $0000–$7FFF
$0000
$8000
$FFFF
$7FFF
Memory Map
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