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MC68HC912B32 MOTOROLA

MC68HC912B32TS/D 31

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.

Figure 6 MC68HC912B32 Memory Map

BDM

(IF ACTIVE)

HC812B32 MEM MAP

$8000

$FFFF$FFFF

FLASH EEPROM

$0000

$0800

$0D00

$0FFF

$FF00

$0000

$01FF

$0800

SINGLE CHIP

SPECIAL

SINGLE CHIP

NORMAL

EXPANDED

$8000

VECTORS VECTORS VECTORS

$FF00

$F000

768 BYTES EEPROM

MAP TO ANY 4K SPACE

1-KBYTE RAM

MAP TO ANY 2K SPACE

REGISTERS

MAP TO ANY 2K SPACE

$FFFF

$FFC0

$0BFF

MAP WITH MAPROM BIT

$0D00

512 BYTES RAM

$0000

$7FFF

IN MISC REGISTER

TO $0000 – $7FFF

OR $8000 – $FFFF

$0200

$03FF

SPACE

512 BYTES RAM