MC9S12KT256 Datasheet, PDF (89/594 Pages) Freescale Semiconductor, Inc – Microcontrollers

Scenario
FPHDIS = 1
FPLDIS = 1
7
FPHDIS = 1
FPLDIS = 0
6
FPHDIS = 0
FPLDIS = 1
5
FPHDIS = 0
FPLDIS = 0
4
PPAGE
0x0030–0x0035
0x0038–0x003D
PPAGE
0x0036–0x0037
0x003E–0x003F
Scenario
3
2
1
0
PPAGE
0x0030–0x0035
0x0038–0x003D
PPAGE
0x0036–0x0037
0x003E–0x003F
Unprotected region
Protected region
not defined by FPLS, FPHS
Protected region with size
defined by FPLS
Protected region with size
defined by FPHS
Figure 2-8. Flash Protection Scenarios
2.3.2.6 Flash Protection Restrictions
The general guideline is that Flash protection can only be added and not removed. Table 2-15 specifies all
valid transitions between Flash protection scenarios. 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
MC9S12KT256 Data Sheet, Rev 1.15
Freescale Semiconductor
89