PC912XDP512F0MPVR datasheet(1232/1348 Pages) FREESCALE

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Chapter 30 Security (S12X9SECV2)

MC9S12XDP512 Data Sheet, Rev. 2.21

1234

Freescale Semiconductor

30.1.4.1

Normal Single Chip Mode (NS)

•

Background debug module (BDM) operation is completely disabled.

•

Execution of Flash and EEPROM commands is restricted. Please refer to the NVM block guide

(FTX) for details.

•

Tracing code execution using the DBG module is disabled.

•

Debugging XGATE code (breakpoints, single-stepping) is disabled.

30.1.4.2

Special Single Chip Mode (SS)

•

BDM ﬁrmware commands are disabled.

•

BDM hardware commands are restricted to the register space.

•

Execution of Flash and EEPROM commands is restricted. Please refer to the NVM block guide

(FTX) for details.

•

Tracing code execution using the DBG module is disabled.

•

Debugging XGATE code (breakpoints, single-stepping) is disabled.

Special single chip mode means BDM is active after reset. The availability of BDM ﬁrmware commands

depends on the security state of the device. The BDM secure ﬁrmware ﬁrst performs a blank check of both

the Flash memory and the EEPROM. If the blank check succeeds, security will be temporarily turned off

and the state of the security bits in the appropriate Flash memory location can be changed If the blank

check fails, security will remain active, only the BDM hardware commands will be enabled, and the

accessible memory space is restricted to the peripheral register area. This will allow the BDM to be used

to erase the EEPROM and Flash memory without giving access to their contents. After erasing both Flash

memory and EEPROM, another reset into special single chip mode will cause the blank check to succeed

and the options/security byte can be programmed to “unsecured” state via BDM.

While the BDM is executing the blank check, the BDM interface is completely blocked, which means that

all BDM commands are temporarily blocked.

30.1.4.3

Expanded Modes (NX, ES, EX, and ST)

•

BDM operation is completely disabled.

•

Internal Flash memory and EEPROM are disabled.

•

Execution of Flash and EEPROM commands is restricted. Please refer to the NVM block guide

(FTX) for details.

•

Tracing code execution using the DBG module is disabled.

•

Debugging XGATE code (breakpoints, single-stepping) is disabled.

•

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