MC9S12C Datasheet, PDF (546/680 Pages) Motorola, Inc – 16-Bit Microcontroller

Chapter 19 64 Kbyte Flash Module (S12FTS64KV4)
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 19-9. Flash Protection Scenarios
19.3.2.5.1 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 19-12. 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 19-12. 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
546
MC9S12C-Family / MC9S12GC-Family
Freescale Semiconductor
Rev 01.23