MC9S12G FREESCALE [Freescale Semiconductor, Inc], MC9S12G Datasheet - Page 748

• Manufacturer Part Number: MC9S12G
• Description: Ignores external trigger. Performs one conversion sequence and stops.
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

32 KByte Flash Module (S12FTMRG32K1V1)
user-supplied keys match those stored in the Flash security bytes of the Flash configuration field (see
Table
containing the backdoor comparison key to avoid code runaway.
Upon clearing CCIF to launch the Verify Backdoor Access Key command, the Memory Controller will
check the FSEC KEYEN bits to verify that this command is enabled. If not enabled, the Memory
Controller sets the ACCERR bit in the FSTAT register and terminates. If the command is enabled, the
Memory Controller compares the key provided in FCCOB to the backdoor comparison key in the Flash
configuration field with Key 0 compared to 0x3_FF00, etc. If the backdoor keys match, security will be
released. If the backdoor keys do not match, security is not released and all future attempts to execute the
Verify Backdoor Access Key command are aborted (set ACCERR) until a reset occurs. The CCIF flag is
set after the Verify Backdoor Access Key operation has completed.
22.4.6.12 Set User Margin Level Command
The Set User Margin Level command causes the Memory Controller to set the margin level for future read
operations of the P-Flash or EEPROM block.
748
This document is valid for the S12G96 and the S12G128 device. All information related to other devices is preliminary.
22-4). The Verify Backdoor Access Key command must not be executed from the Flash block
Register
FSTAT
Table 22-52. Verify Backdoor Access Key Command FCCOB Requirements
CCOBIX[2:0]
Table 22-54. Set User Margin Level Command FCCOB Requirements
Table 22-53. Verify Backdoor Access Key Command Error Handling
000
001
CCOBIX[2:0]
MGSTAT1
MGSTAT0
ACCERR
Error Bit
FPVIOL
000
001
010
011
100
MC9S12G Family Reference Manual,
Set if CCOBIX[2:0] != 100 at command launch
Set if an incorrect backdoor key is supplied
Set if backdoor key access has not been enabled (KEYEN[1:0] != 10, see
Section
Set if the backdoor key has mismatched since the last reset
None
None
None
0x0D
22.3.2.2)
0x0C
FCCOB Parameters
FCCOB Parameters
Margin level setting.
Key 0
Key 1
Key 2
Key 3
Flash block selection code [1:0]
Error Condition
Rev.1.01
Table 22-34
Not required
. See
Freescale Semiconductor