NVM_FSEC field descriptions (continued)
Field
Description
5–2
Reserved
This field is reserved.
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
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.
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.
4.6.4 Flash Configuration Register (NVM_FCNFG)
The FCNFG register enables the flash command complete interrupt and forces ECC
faults on flash array read access from the CPU.
Address: 3020h base + 4h offset = 3024h
Bit
7
6
5
4
3
2
1
0
Read
Write
Reset
0
0
0
0
0
0
0
0
Flash and EEPROM registers descriptions
MC9S08PA4 Reference Manual, Rev. 5, 08/2017
88
NXP Semiconductors
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