S912XEG384J3VA Datasheet, PDF(1186/1324 Page) Freescale Semiconductor, Inc – MC9S12XEP100 Reference Manual Covers MC9S12XE Family

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S912XEG384J3VA Datasheet, PDF (1186/1324 Pages) Freescale Semiconductor, Inc – MC9S12XEP100 Reference Manual Covers MC9S12XE Family

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Chapter 29 1024 KByte Flash Module (S12XFTM1024K5V2)

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

conï¬guration ï¬eld with Key 0 compared to 0x7F_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.

Table 29-56. Verify Backdoor Access Key Command Error Handling

Register

FSTAT

FERSTAT

Error Bit

ACCERR

FPVIOL

MGSTAT1

MGSTAT0

EPVIOLIF

Error Condition

Set if CCOBIX[2:0] != 100 at command launch

Set if a Load Data Field command sequence is currently active

Set if an incorrect backdoor key is supplied

Set if backdoor key access has not been enabled (KEYEN[1:0] != 10, see

Section 29.3.2.2)

Set if the backdoor key has mismatched since the last reset

None

None

None

None

29.4.2.13 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 a specific P-Flash or D-Flash block.

Table 29-57. Set User Margin Level Command FCCOB Requirements

CCOBIX[2:0]

000

001

0x0D

FCCOB Parameters

Global address [22:16] to identify the

Flash block

Margin level setting

Upon clearing CCIF to launch the Set User Margin Level command, the Memory Controller will set the

user margin level for the targeted block and then set the CCIF ï¬ag.

Valid margin level settings for the Set User Margin Level command are deï¬ned in Table 29-58.

Table 29-58. Valid Set User Margin Level Settings

CCOB

(CCOBIX=001)

0x0000

0x0001

Level Description

Return to Normal Level

User Margin-1 Level(1)

1186

MC9S12XE-Family Reference Manual Rev. 1.25

Freescale Semiconductor

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