mc9s12e256 Freescale Semiconductor, Inc, mc9s12e256 Datasheet - Page 96

• Manufacturer Part Number: mc9s12e256
• Description: Hcs12 Microcontrollers 16-bit Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Chapter 2 256 Kbyte Flash Module (FTS256K2V1)
2.3.2.6
The general guideline is that Flash protection can only be added and not removed.
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.
2.3.2.7
The banked FSTAT register defines the operational status of the module.
96
Reset
Reset
W
W
R
R
CBEIF
CBEIF
Flash Protection Restrictions
Flash Status Register (FSTAT)
7
1
7
1
1
Allowed transitions marked with X.
Protection
Scenario
From
= Unimplemented or Reserved
= Unimplemented or Reserved
0
1
2
3
4
5
6
7
Figure 2-11. Flash Status Register (FSTAT — Special Mode)
Figure 2-10. Flash Status Register (FSTAT — Normal Mode)
CCIF
CCIF
6
1
6
1
Table 2-15. Flash Protection Scenario Transitions
X
X
0
PVIOL
PVIOL
MC9S12E256 Data Sheet, Rev. 1.08
5
0
5
0
1
X
X
X
X
ACCERR
ACCERR
X
X
X
X
2
To Protection Scenario
4
0
4
0
X
X
X
X
X
X
X
X
3
3
0
0
3
0
0
X
X
X
X
4
1
5
X
X
BLANK
BLANK
2
0
2
0
X
X
6
Table 2-15
Freescale Semiconductor
FAIL
X
7
1
0
0
1
0
specifies all
0
0
0
0
0
0