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SC312XDP512F0MPVR датащи(PDF) 1119 Page - Freescale Semiconductor, Inc

номер детали SC312XDP512F0MPVR
подробное описание детали  HCS12X Microcontrollers
PDF  1348 Pages
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производитель  FREESCALE [Freescale Semiconductor, Inc]
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SC312XDP512F0MPVR датащи(HTML) 1119 Page - Freescale Semiconductor, Inc

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Chapter 27 512 Kbyte Flash Module (S12XFTX512K4V2)
MC9S12XDP512 Data Sheet, Rev. 2.21
Freescale Semiconductor
1121
27.3.2.5.1
Flash Protection Restrictions
The general guideline is that Flash protection can only be added and not removed. Table 27-15 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
FPROT register reflect the active protection scenario. See the FPHS and FPLS descriptions for additional
restrictions.
27.3.2.6
Flash Status Register (FSTAT)
The FSTAT register defines the operational status of the module.
Table 27-15. Flash Protection Scenario Transitions
From
Protection Scenario
To Protection Scenario1
1 Allowed transitions marked with X.
01234567
0
XXXX
1
XX
2
XX
3
X
4
XX
5
XXXX
6
XX
XX
7
XXXXXXXX
76543210
R
CBEIF
CCIF
PVIOL
ACCERR
0
BLANK
0
0
W
Reset
11000000
= Unimplemented or Reserved
Figure 27-12. Flash Status Register (FSTAT — Normal Mode)
76543210
R
CBEIF
CCIF
PVIOL
ACCERR
0
BLANK
FAIL
0
W
Reset
11000000
= Unimplemented or Reserved
Figure 27-13. Flash Status Register (FSTAT — Special Mode)



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