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S9S12HZ256J3MAL Datasheet(PDF) 71 Page - Freescale Semiconductor, Inc

Part # S9S12HZ256J3MAL
Description  Microcontrollers
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Manufacturer  FREESCALE [Freescale Semiconductor, Inc]
Direct Link  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

S9S12HZ256J3MAL Datasheet(HTML) 71 Page - Freescale Semiconductor, Inc

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Chapter 2 256 Kbyte Flash Module (FTS256K2V1)
MC9S12HZ256 Data Sheet, Rev. 2.05
Freescale Semiconductor
71
Figure 2-9. 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
7
6
5
4
3
2
1
0
FPHDIS = 1
FPLDIS = 1
FPHDIS = 1
FPLDIS = 0
FPHDIS = 0
FPLDIS = 1
FPHDIS = 0
FPLDIS = 0
Scenario
Scenario
Unprotected region
Protected region with size
Protected region
Protected region with size
defined by FPLS
defined by FPHS
not defined by FPLS, FPHS
PPAGE 0x0036–0x0037
0x003E–0x003F
PPAGE 0x0030–0x0035
0x0038–0x003D
PPAGE 0x0036–0x0037
0x003E–0x003F
PPAGE 0x0030–0x0035
0x0038–0x003D


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