MC9S12HZ256 Datasheet, PDF (662/692 Pages) Freescale Semiconductor, Inc – HCS12 Microcontrollers

Appendix E ROM Description
Appendix E
ROM Description
E.1 Memory Map and Register Definition
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 Configuration 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. 2.04
662
Freescale Semiconductor