MC3S12RG128 Datasheet, PDF (26/546 Pages) Freescale Semiconductor, Inc – Microcontrollers

Chapter 1 Device Overview (MC3S12RG128V1)
$0000
$0400
$2000
$4000
$0000
$03FF
1K Register Space
Mappable to any 2K Boundary
$2000
8K Bytes RAM
$3FFF ^{Mappable to any 8K Boundary}
$4000
16K Fixed ROM
$8000
EXT
$7FFF
$8000
16K Page Window
four * 16K ROM Pages
$C000
$FF00
$FFFF
VECTORS
NORMAL
SINGLE CHIP
VECTORS
EXPANDED
VECTORS
SPECIAL
SINGLE CHIP
$BFFF
$C000
$FFFF
$FF00
$FFFF
16K Fixed ROM
BDM
(If Active)
The figure shows a useful map, which is not the map out of reset. After reset the map is:
$0000 - $03FF: Register Space
$0000 - $1FFF: 8K RAM
Figure 1-3. MC3S12R64 Memory Map
NOTE
To ensure compatibility with the MC9S12D64 FLASH devices, the internal
RAM should not be remapped to a location outside of the first 16K page
($0000−$3FFF) in the memory map.
The internal RAM of the MC9S12D64 device and the MC3S12R64 device
differ in size (4K vs. 8K). Therefore re-mapping the internal RAM outside
of the first 16K page results in different sizes of visible FLASH or ROM
space: a 4K RAM will leave 12K of a 16K page unmasked while the 8K
RAM will only leave 8K of a 16K page unmasked.
MC3S12RG128 Data Sheet, Rev. 1.05
26
Freescale Semiconductor