mc9s12vr48 Freescale Semiconductor, Inc, mc9s12vr48 Datasheet - Page 114

• Manufacturer Part Number: mc9s12vr48
• Description: S12 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

S12G Memory Map Controller (S12GMMCV1)
3.4.3
The S12GMMC is capable of mapping up 64K of flash, 512 bytes of EEPROM and 2K of RAM into the
global memory map{statement}. Smaller devices of theS12VR-family do not utilize all of the available
address space. Address ranges which are not associated with one of the on-chip memories fall into two
categories: Unimplemented addresses and reserved addresses.
Unimplemented addresses are not mapped to any of the on-chip memories. The S12GMMC is aware that
accesses to these address location have no destination and triggers a system reset (illegal address reset)
whenever they are attempted by the CPU. The BDM is not able to trigger illegal address resets.
Reserved addresses are associated with a memory block on the device, even though the memory block does
not contain the resources to fill the address space. The S12GMMC is not aware that the associated memory
does not physically exist. It does not trigger an illegal address reset when accesses to reserved locations
are attempted.
Table 3-9
3.4.4
On S12VR devices, the CPU and the BDM are not able to access the memory in parallel. An arbitration
occurs whenever both modules attempt a memory access at the same time. CPU accesses are handled with
114
shows the global address ranges of all members of the S12VR-family.
Unimplemented and Reserved Address Ranges
Prioritization of Memory Accesses
MC9S12VR Family Reference Manual,
Preliminary - Subject to Change Without Notice
Table 3-9. Global Address Ranges
(NVMRES
(NVMRES
0x00000-
0x00400-
0x00800-
0x03800-
0x04000-
0x04000-
0x08000-
0x30000-
0x34000-
0x03FFF
0x07FFF
0x07FFF
0x33FFF
0x3FFFF
0x003FF
0x005FF
0x037FF
0x30000
=1)
=0)
Internal NVM Resources
S12VR48
Reserved
48k
Unimplemented
Unimplemented
Register Space
EEPROM
RAM
0.5k
2k
S12VR64
Flash
64k
Rev. 2.2
Freescale Semiconductor