S912XEP100J5MAGR Freescale Semiconductor, S912XEP100J5MAGR Datasheet - Page 938

• Manufacturer Part Number: S912XEP100J5MAGR
• Description: S912XEP Series 16 Bit 50 Mhz 1 MB Flash 64 KB Ram Microcontroller - LQFP-144
• Manufacturer: Freescale Semiconductor

Chapter 25 256 KByte Flash Module (S12XFTM256K2V1)
25.4.2.11 Unsecure Flash Command
The Unsecure Flash command will erase the entire P-Flash and D-Flash memory space and, if the erase is
successful, will release security.
Upon clearing CCIF to launch the Unsecure Flash command, the Memory Controller will erase the entire
P-Flash and D-Flash memory space and verify that it is erased. If the Memory Controller verifies that the
entire Flash memory space was properly erased, security will be released. If the erase verify is not
successful, the Unsecure Flash operation sets MGSTAT1 and terminates without changing the security
state. During the execution of this command (CCIF=0) the user must not write to any Flash module
register. The CCIF flag is set after the Unsecure Flash operation has completed.
25.4.2.12 Verify Backdoor Access Key Command
The Verify Backdoor Access Key command will only execute if it is enabled by the KEYEN bits in the
FSEC register (see
supplied keys match those stored in the Flash security bytes of the Flash configuration field (see
3). The Verify Backdoor Access Key command must not be executed from the Flash block containing the
backdoor comparison key to avoid code runaway.
938
FERSTAT
Register
FSTAT
Table 25-55. Verify Backdoor Access Key Command FCCOB Requirements
Table
CCOBIX[2:0]
CCOBIX[2:0]
Table 25-53. Unsecure Flash Command FCCOB Requirements
MGSTAT1
MGSTAT0
EPVIOLIF
ACCERR
Error Bit
FPVIOL
000
000
001
010
011
100
Table 25-54. Unsecure Flash Command Error Handling
25-11). The Verify Backdoor Access Key command releases security if user-
MC9S12XE-Family Reference Manual , Rev. 1.23
Set if CCOBIX[2:0] != 000 at command launch
Set if a Load Data Field command sequence is currently active
Set if command not available in current mode (see
Set if any area of the P-Flash memory is protected
Set if any errors have been encountered during the verify operation
Set if any non-correctable errors have been encountered during the verify
operation
Set if any area of the buffer RAM EEE partition is protected
0x0C
0x0B
FCCOB Parameters
FCCOB Parameters
Key 0
Key 1
Key 2
Key 3
Error Condition
Not required
Not required
Table
25-30)
Freescale Semiconductor
Table 25-