mc9s12xd256 Freescale Semiconductor, Inc, mc9s12xd256 Datasheet - Page 1161

• Manufacturer Part Number: mc9s12xd256
• Description: Hcs12x Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

28.3.2.5.1
The general guideline is that Flash protection can only be added and not removed.
all valid transitions between Flash protection scenarios. Any attempt to write an invalid scenario to the
FPROT register will be ignored and the FPROT register will remain unchanged. The contents of the
FPROT register reflect the active protection scenario. See the FPHS and FPLS descriptions for additional
restrictions.
28.3.2.6
The FSTAT register defines the operational status of the module.
Freescale Semiconductor
Reset
Reset
W
W
R
R
CBEIF
CBEIF
1 Allowed transitions marked with X.
Flash Status Register (FSTAT)
Protection Scenario
1
1
7
7
Flash Protection Restrictions
From
= Unimplemented or Reserved
= Unimplemented or Reserved
0
1
2
3
4
5
6
7
Figure 28-12. Flash Status Register (FSTAT — Normal Mode)
Figure 28-13. Flash Status Register (FSTAT — Special Mode)
CCIF
CCIF
1
1
6
6
Table 28-13. Flash Protection Scenario Transitions
X
X
MC9S12XDP512 Data Sheet, Rev. 2.17
0
PVIOL
PVIOL
0
0
5
5
1
X
X
X
X
ACCERR
ACCERR
0
0
4
4
X
X
X
X
2
To Protection Scenario
3
X
X
X
X
X
X
X
X
Chapter 28 256 Kbyte Flash Module (S12XFTX256K2V1)
0
0
0
0
3
3
X
X
X
X
4
BLANK
BLANK
1
X
X
5
0
0
2
2
X
X
6
Table 28-13
FAIL
0
0
0
1
1
X
7
specifies
0
0
0
0
0
0
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