MC9S12C128V1 Datasheet, PDF (514/690 Pages) Freescale Semiconductor, Inc – MC9S12C Family MC9S12GC Family Reference Manual

Chapter 18 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 18-9. Flash Protection Scenarios
18.3.2.5.1 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 18-12. 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 18-12. 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
514
MC9S12C-Family / MC9S12GC-Family
Freescale Semiconductor
Rev 01.24