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MC9S12E128V1 Datasheet, PDF (96/606 Pages) Freescale Semiconductor, Inc – Microcontrollers | |||
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Chapter 2 128 Kbyte Flash Module (FTS128K1V1)
Scenario
FPHDIS = 1
FPLDIS = 1
7
FPHDIS = 1
FPLDIS = 0
6
FPHDIS = 0
FPLDIS = 1
5
FPHDIS = 0
FPLDIS = 0
4
0xFFFF
Scenario
3
2
1
0
0xFFFF
Protected Flash
Figure 2-9. Flash Protection Scenarios
2.3.2.5.1 Flash Protection Restrictions
The general guideline is that protection can only be added, not removed. All valid transitions between
Flash protection scenarios are speciï¬ed in Table 2-12. 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 reï¬ect the active protection scenario.
Table 2-12. Flash Protection Scenario Transitions
From
To Protection Scenario1
Protection
Scenario
0
1
2
3
4
5
6
7
0
X
X
X
X
1
X
X
2
X
X
3
X
4
X
X
5
X
X
X
X
MC9S12E128 Data Sheet, Rev. 1.07
96
Freescale Semiconductor
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