Datasheet

Chapter 20 96 Kbyte Flash Module (S12FTS96KV1)
Freescale Semiconductor MC9S12C-Family / MC9S12GC-Family 589
Rev 01.24
Figure 20-11. Flash Protection Scenarios
20.3.2.5.1 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 20-13. 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 20-13. Flash Protection Scenario Transitions
From
Protection
Scenario
To Protection Scenario
(1)
01234567
0 XXXX
1XX
2XX
3X
4XX
5 XXXX
7 6 5 4
FPOPEN = 1
3 2 1 0
FPHS[1:0]
FPLS[1:0]
FPOPEN = 0
FPHDIS = 1
FPLDIS = 1
FPHDIS = 1
FPLDIS = 0
FPHDIS = 0
FPLDIS = 1
FPHDIS = 0
FPLDIS = 0
Scenario
Scenario
Protected Flash
FPHS[1:0]
FPLS[1:0]
0xFFFF
0xFFFF