Freescale Semiconductor Block Guide, EETX4K warranty Wait Mode, Stop Mode, Background Debug Mode

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Freescale Semiconductor, Inc.

Freescale Semiconductor, Inc.

Block Guide — S12EETX4KV0 V00.04

4.2 Wait Mode

If a command is active (CCIF=0) when the MCU enters the WAIT mode, the active command and any buffered command will be completed.

The EEPROM module can recover the MCU from WAIT if the CBEIF and CCIF interrupts are enabled (see section 4.7).

4.3 Stop Mode

If a command is active (CCIF = 0) when the MCU enters the STOP mode, the operation will be aborted and, if the operation is program, sector erase, mass erase, or sector modify, the EEPROM array data being programmed or erased may be corrupted and the CCIF and ACCERR flags will be set. If active, the high voltage circuitry to the EEPROM memory will immediately be switched off when entering STOP mode. Upon exit from STOP, the CBEIF flag is set and any buffered command will not be launched. The ACCERR flag must be cleared before starting a command write sequence (see section 4.1.2).

NOTE: As active commands are immediately aborted when the MCU enters STOP mode, it is strongly recommended that the user does not use the STOP command during program, sector erase, mass erase, or sector modify operations.

4.4 Background Debug Mode

In background debug mode (BDM), the EPROT register is writable. If the MCU is unsecured, then all EEPROM commands listed in Table 4-1can be executed. If the MCU is secured and is in special single chip mode, the only command available to execute is mass erase.

4.5 EEPROM Module Security

The EEPROM module does not provide any security information to the MCU. After each reset, the security state of the MCU is a function of information provided by the Flash module (see the specific FTX Block Guide).

4.5.1 Unsecuring the MCU in Special Single Chip Mode via the BDM

Before the MCU can be unsecured in special single chip mode, the EEPROM memory must be erased using the following method:

•Reset the MCU into special single chip mode, delay while the erase test is performed by the BDM secure ROM, send BDM commands to disable protection in the EEPROM module, and execute a mass erase command write sequence to erase the EEPROM memory.

After the CCIF flag sets to indicate that the EEPROM mass operation has completed and assuming that the Flash memory has also been erased, reset the MCU into special single chip mode. The BDM secure ROM will verify that the Flash and EEPROM memory are erased and will assert the UNSEC bit in the

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Contents Freescale Semiconductor, Inc Original Release Date 7 JUL Revised 30 OCT Motorola, IncRevision History Table of Contents Freescale Semiconductor, Inc List of Figures Freescale Semiconductor, Inc List of Tables Freescale Semiconductor, Inc Freescale Semiconductor, Inc Freescale Semiconductor, Inc Features IntroductionOverview Modes of OperationBlock Diagram InterfaceClock DividerExternal Signal Description Module Memory Map Memory Map and RegistersEeprom Configuration Field Eeprom Memory Map Address Register Name Normal Mode Offset Access Eeprom Register MapRegister Descriptions Eclkdiv Eeprom Clock Divider RegisterEcnfg Eeprom Configuration Register RESERVED2Eprot Eeprom Protection Register Eeprom Protection Register EprotEstat Eeprom Status Register Eeprom Protection Address RangeEcmd Eeprom Command Register Eeprom Command Register Ecmd Valid Eeprom Command ListEaddr Eeprom Address Registers Edata Eeprom Data Registers13 Eeprom Data Low Register Edatalo Functional Description Eeprom Command OperationsWriting the Eclkdiv Register 200 -182 ⁄ 200 × 100 = 9% Determination Procedure for PRDIV8 and Ediv Bits Eeprom Commands Command Write SequenceEeprom Command Description Erase Verify Command SectorExample Erase Verify Command Flow Program Command Freescale Semiconductor, Inc Example Program Command Flow Sector Erase Command Freescale Semiconductor, Inc Example Sector Erase Command Flow Mass Erase Command Example Mass Erase Command Flow Sector Erase Abort Command Freescale Semiconductor, Inc Ccif Example Sector Modify Command Flow Illegal Eeprom Operations3.5 Wait Mode Stop ModeBackground Debug Mode Unsecuring the MCU in Special Single Chip Mode via the BDMResets Eeprom Reset SequenceReset While Eeprom Command Active InterruptsEeprom Interrupt Implementation Index Freescale Semiconductor, Inc Block Guide End Sheet Final Pages

Block Guide, EETX4K specifications

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