MC9S12E64CFUE Datasheet, PDF (96/606 Pages) Freescale Semiconductor, Inc – Microcontrollers

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 specified 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 reflect 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