MC3S12RG128 Datasheet, PDF (437/546 Pages) Freescale Semiconductor, Inc – Microcontrollers

Chapter 15 Read-Only Memory 64K x 16 (ROM64KX16V1) Block Description
15.3.1 Module Memory Map
The ROM64KX16 module occupies a 16 byte memory space within the on-chip memory map (address
offsets $0000 − $000F). A summary of the ROM control registers is given in Figure 15-2 while their
accessibility is detailed in section Section 15.3.2, “Register Descriptions”.
Address
0x0000
0x0001
0x0002
0x0003
0x0004 −
0x000B
0x000C
0x000D
0x000E
0x000F
Name
Reserved
ROPT
Reserved
RCNFG
Reserved
RDSC0
RDSC1
RDSC2
RESERVED
Bit 7
R
0
W
R KEYEN1
W
R
0
W
R
0
W
R
0
W
R
W
R
W
R
W
R
0
W
6
5
0
0
KEYEN0 NV5
0
0
0
KEYACC
0
0
0
0
4
3
0
0
NV4
NV3
0
0
0
0
0
0
DSC0[7:0]
DSC1[7:0]
DSC2[7:0]
0
0
= Unimplemented or Reserved
2
0
NV2
0
0
0
0
1
0
SEC1
0
0
0
Bit 0
0
SEC0
0
0
0
0
0
Figure 15-2. ROM64KX16 Register Summary
15.3.2 Register Descriptions
15.3.2.1 ROM Options Register (ROPT)
Module Base + 0x0001
7
R KEYEN1
6
KEYEN0
5
NV5
W
Reset
R¹
R¹
R¹
1 _{Read from non-volatile registers in ROM}
4
NV4
R¹
3
NV3
R¹
2
NV2
R¹
Read: Anytime
Write: Never
Figure 15-3. ROM Options Register (ROPT)
1
SEC1
R¹
0
SEC0
R¹
MC3S12RG128 Data Sheet, Rev. 1.05
Freescale Semiconductor
437