PC912XDP512F0MPVR datasheet(1068/1348 Pages) FREESCALE

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Chapter 25 2 Kbyte EEPROM Module (S12XEETX2KV1)

MC9S12XDP512 Data Sheet, Rev. 2.21

1070

Freescale Semiconductor

25.6.1

Unsecuring the MCU in Special Single Chip Mode using 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 BDM

status register. This BDM action will cause the MCU to override the Flash security state and the MCU will

be unsecured. Once the MCU is unsecured, BDM commands will be enabled and the Flash security byte

may be programmed to the unsecure state.

25.7

Resets

25.7.1

EEPROM Reset Sequence

On each reset, the EEPROM module executes a reset sequence to hold CPU activity while loading the

EPROT register from the EEPROM memory according to Table 25-1.

25.7.2

Reset While EEPROM Command Active

If a reset occurs while any EEPROM command is in progress, that command will be immediately aborted.

The state of a word being programmed or the sector / block being erased is not guaranteed.

25.8

Interrupts

The EEPROM module can generate an interrupt when all EEPROM command operations have completed,

when the EEPROM address, data, and command buffers are empty.

NOTE

Vector addresses and their relative interrupt priority are determined at the

MCU level.

Table 25-10. EEPROM Interrupt Sources

Interrupt Source

Interrupt Flag

Local Enable

Global (CCR) Mask

EEPROM address, data, and command buffers empty

CBEIF

(ESTAT register)

CBEIE

(ECNFG register)

I Bit

All EEPROM commands completed

CCIF

(ESTAT register)

CCIE

(ECNFG register)

I Bit

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