Datasheet

NVM_FSEC field descriptions
Field Description
7–6
KEYEN
Backdoor Key Security Enable Bits
The KEYEN[1:0] bits define the enabling of backdoor key access to the flash module.
NOTE: 01 is the preferred KEYEN state to disable backdoor key access.
00 Disabled
01 Disabled
10 Enabled
11 Disabled
5–2
Reserved
This field is reserved.
1–0
SEC
Flash Security Bits
The SEC[1:0] bits define the security state of the MCU. If the flash module is unsecured using backdoor
key access, the SEC bits are forced to 10.
NOTE: 01 is the preferred SEC state to set MCU to secured state.
00 Secured
01 Secured
10 Unsecured
11 Secured
4.6.3 Flash CCOB Index Register (NVM_FCCOBIX)
The FCCOBIX register is used to index the FCCOB register for NVM memory
operations.
Address: 3020h base + 2h offset = 3022h
Bit 7 6 5 4 3 2 1 0
Read 0
CCOBIX
Write
Reset
0 0 0 0 0 0 0 0
NVM_FCCOBIX field descriptions
Field Description
7–3
Reserved
This field is reserved.
This read-only field is reserved and always has the value 0.
2–0
CCOBIX
Common Command Register Index
The CCOBIX bits are used to select which word of the FCCOB register array is being read or written to.
Chapter 4 Memory map
MC9S08PA60 Reference Manual, Rev. 1, 9/2012
Freescale Semiconductor, Inc. 107