mc9s12hz256v2 Freescale Semiconductor, Inc, mc9s12hz256v2 Datasheet - Page 664

• Manufacturer Part Number: mc9s12hz256v2
• Description: Hcs12 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Appendix E ROM Description
E.1.3
This register contains a copy of the Device SC number which is stored in the non-volatile registers at
addresses 0xFF0C, 0xFF0D and 0xFF0E.
E.1.4
A range of addresses in the ROM is reserved for the security bits and backdoor key. In addition, some
locations are reserved for the ROM device SC number and for the 32 bit CRC value used by the BIST
control.
664
Reset
DSCn
0xFF00 –
0xFF07
0xFF08
0xFF09
0xFF0A
0xFF0B
0xFF0C
0xFF0D
0xFF0E
0xFF0F
Field
Address Register Name
7:0
W
R
Device SC Number Registers
Non-volatile Registers
Device SC Number byte n (n= 0,1 or 2) — Reads Device SC number
NVBACKKEY
NVCRC0
NVCRC1
NVCRC2
NVCRC3
NVSC0
NVSC1
NVSC2
NVOPT
R
7
Please note that backdoor keywords 0x0000 or 0xFFFF are invalid and will
effectively disable backdoor key access when used.
R
= Unimplemented or Reserved
6
KEYEN1
Table E-5. Non-volatile Register Summary
7
Figure E-3. Device SC Number (DSCn)
Table E-4. DSCn Field Descriptions
MC9S12HZ256 Data Sheet, Rev. 2.05
R
5
KEYEN0
6
NOTE
R
4
NV5
5
Description
DSCn
Device SC number byte0
Device SC number byte1
Device SC number byte2
8-Byte Comparison Key
CRC value byte0
CRC value byte1
CRC value byte2
CRC value byte3
NV4
4
R
3
NV3
3
R
2
NV2
2
Freescale Semiconductor
R
1
SEC1
1
SEC0
R
0
0