16 KByte Flash Module (S12FTMRG16K1V1)
MC9S12G Family Reference Manual Rev.1.27
NXP Semiconductors 787
24.3.2.16 Flash Option Register (FOPT)
The FOPT register is the Flash option register.
All bits in the FOPT register are readable but are not writable.
During the reset sequence, the FOPT register is loaded from the Flash nonvolatile byte in the Flash
configuration field at global address 0x3_FF0E located in P-Flash memory (see Table 24-4) as indicated
by reset condition F in Figure 24-21. If a double bit fault is detected while reading the P-Flash phrase
containing the Flash nonvolatile byte during the reset sequence, all bits in the FOPT register will be set.
24.3.2.17 Flash Reserved5 Register (FRSV5)
This Flash register is reserved for factory testing.
All bits in the FRSV5 register read 0 and are not writable.
24.3.2.18 Flash Reserved6 Register (FRSV6)
This Flash register is reserved for factory testing.
Offset Module Base + 0x0010
76543210
R NV[7:0]
W
Reset F
1
1
Loaded from IFR Flash configuration field, during reset sequence.
F
1
F
1
F
1
F
1
F
1
F
1
F
1
= Unimplemented or Reserved
Figure 24-21. Flash Option Register (FOPT)
Table 24-23. FOPT Field Descriptions
Field Description
7–0
NV[7:0]
Nonvolatile Bits — The NV[7:0] bits are available as nonvolatile bits. Refer to the device user guide for proper
use of the NV bits.
Offset Module Base + 0x0011
76543210
R00000000
W
Reset00000000
= Unimplemented or Reserved
Figure 24-22. Flash Reserved5 Register (FRSV5)
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