mc9s12xs128 Freescale Semiconductor, Inc, mc9s12xs128 Datasheet - Page 524
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mc9s12xs128
Manufacturer Part Number
mc9s12xs128
Description
Hcs12 Microcontrollers 16-bit Automotive Microcontroller
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MC9S12XS128.pdf
(738 pages)
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256 KByte Flash Module (S12XFTMR256K1V1)
18.3.2.9
The FPROT register defines which P-Flash sectors are protected against program and erase operations.
The (unreserved) bits of the FPROT register are writable with the restriction that the size of the protected
region can only be increased (see
During the reset sequence, the FPROT register is loaded with the contents of the P-Flash protection byte
in the Flash configuration field at global address 0x7F_FF0C located in P-Flash memory (see
as indicated by reset condition ‘F’ in
during the reset sequence, the upper sector of the P-Flash memory must be unprotected, then the P-Flash
protection byte must be reprogrammed. If a double bit fault is detected while reading the P-Flash phrase
containing the P-Flash protection byte during the reset sequence, the FPOPEN bit will be cleared and
remaining bits in the FPROT register will be set to leave the P-Flash memory fully protected.
Trying to alter data in any protected area in the P-Flash memory will result in a protection violation error
and the FPVIOL bit will be set in the FSTAT register. The block erase of a P-Flash block is not possible
if any of the P-Flash sectors contained in the same P-Flash block are protected.
524
Offset Module Base + 0x0008
Reset
DFDIF
SFDIF
Field
1
0
W
R
FPOPEN
Double Bit Fault Detect Interrupt Flag — The setting of the DFDIF flag indicates that a double bit fault was
detected in the stored parity and data bits during a Flash array read operation or that a Flash array read operation
was attempted on a Flash block that was under a Flash command operation. The DFDIF flag is cleared by writing
a 1 to DFDIF. Writing a 0 to DFDIF has no effect on DFDIF.
0 No double bit fault detected
1 Double bit fault detected or an invalid Flash array read operation attempted
Single Bit Fault Detect Interrupt Flag — With the IGNSF bit in the FCNFG register clear, the SFDIF flag
indicates that a single bit fault was detected in the stored parity and data bits during a Flash array read operation
or that a Flash array read operation was attempted on a Flash block that was under a Flash command operation.
The SFDIF flag is cleared by writing a 1 to SFDIF. Writing a 0 to SFDIF has no effect on SFDIF.
0 No single bit fault detected
1 Single bit fault detected and corrected or an invalid Flash array read operation attempted
P-Flash Protection Register (FPROT)
F
7
= Unimplemented or Reserved
RNV6
F
6
Figure 18-13. Flash Protection Register (FPROT)
Table 18-16. FERSTAT Field Descriptions
Section 18.3.2.9.1, “P-Flash Protection Restrictions,” and Table
S12XS Family Reference Manual, Rev. 1.10
FPHDIS
Figure
F
5
18-13. To change the P-Flash protection that will be loaded
F
4
FPHS[1:0]
Description
F
3
FPLDIS
F
2
Freescale Semiconductor
F
1
FPLS[1:0]
Table
18-21).
F
0
18-3)
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