PC912XDP512F0CFVR datasheet(1102/1348 Pages) FREESCALE

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Chapter 26 4 Kbyte EEPROM Module (S12XEETX4KV2)

MC9S12XDP512 Data Sheet, Rev. 2.21

1104

Freescale Semiconductor

26.5

Operating Modes

26.5.1

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 mode if the CBEIF and CCIF interrupts are enabled

(see Section 26.8, “Interrupts”).

26.5.2

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 mode, 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 26.4.1.2,

“Command Write Sequence”).

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

instruction during program, sector erase, mass erase, or sector modify

operations.

26.5.3

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 26-10 can be executed. If the MCU is secured and is in special single

chip mode, the only command available to execute is mass erase.

26.6

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).

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