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MC9S12Q128_10 Datasheet, PDF (474/644 Pages) Freescale Semiconductor, Inc – HCS12 Microcontrollers | |||
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Chapter 17 32 Kbyte Flash Module (S12FTS32KV1)
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 17-9. Flash Protection Scenarios
17.3.2.5.1 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 17-12. 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 17-12. Flash Protection Scenario Transitions
From
To Protection Scenario(1)
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
474
MC9S12Q128
Freescale Semiconductor
Rev 1.10
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