mc9s12hz256v2 Freescale Semiconductor, Inc, mc9s12hz256v2 Datasheet - Page 662

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

Appendix E ROM Description
Appendix E
ROM Description
E.1
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.
E.1.1
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.
662
Reset
W
R
Memory Map and Register Definition
KEYEN1
ROM Options Register (ROPT)
R
7
Address
0x0104-
0x010C
0x010D
0x010B
0x010E
0x010F
0x0100
0x0101
0x0102
0x0103
KEYEN0
R
= Unimplemented or Reserved
6
ROM Configuration Register (RCNFG)
Figure E-1. ROM Options Register (ROPT)
Device SC number byte0 (DSC0)
Device SC number byte1 (DSC1)
Device SC number byte2 (DSC2)
ROM Options Register (ROPT)
MC9S12HZ256 Data Sheet, Rev. 2.05
NV5
R
5
Table E-1. ROM Memory Map
Reserved
Reserved
Reserved
Reserved
Use
NV4
R
4
NV3
R
3
R = Read from ROM
NV2
R
2
Read/Write
Access
Read
Read
Read
Read
Read
Read
Read
Read
Freescale Semiconductor
SEC1
R
1
SEC0
R
0