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MC9S12HZ128VAL Datasheet, PDF (662/692 Pages) Freescale Semiconductor, Inc – MC9S12HZ256 Data Sheet, Rev. 2.05 | |||
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Appendix E ROM Description
Appendix E
ROM Description
E.1 Memory Map and Register Deï¬nition
ROM control registers are located in the same place as the 16-byte memory space for Flash control
registers 0x0100-0x010F. There are no EEPROM control registers in a ROM device and register locations
0x0110-0x011F are reserved.
Address
0x0100
0x0101
0x0102
0x0103
0x0104-
0x010B
0x010C
0x010D
0x010E
0x010F
Table E-1. ROM Memory Map
Use
Reserved
ROM Options Register (ROPT)
Reserved
ROM Conï¬guration Register (RCNFG)
Reserved
Device SC number byte0 (DSC0)
Device SC number byte1 (DSC1)
Device SC number byte2 (DSC2)
Reserved
Access
Read
Read
Read
Read/Write
Read
Read
Read
Read
Read
E.1.1 ROM Options Register (ROPT)
Upon reset the contents of the non-volatile location NVOPT are copied from ROM into ROPT. This
register may be read at any time, but writes have no meaning or effect.
7
R KEYEN1
W
Reset
R
6
KEYEN0
5
NV5
4
NV4
3
NV3
2
NV2
1
SEC1
R
R
R
R
R
R
= Unimplemented or Reserved
R = Read from ROM
Figure E-1. ROM Options Register (ROPT)
0
SEC0
R
MC9S12HZ256 Data Sheet, Rev. 2.05
662
Freescale Semiconductor
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