CSM9S12XDT512SLK Freescale Semiconductor, CSM9S12XDT512SLK Datasheet - Page 1229

Manufacturer Part Number

CSM9S12XDT512SLK

KIT STUDENT LEARNING 16BIT

Manufacturer

Freescale Semiconductor

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Security (S12X9SECV2)

This speciﬁcation describes the function of the security mechanism in the S12X chip family

(S12X9SECV2).

The user must be reminded that part of the security must lie with the application code. An extreme example

would be application code that dumps the contents of the internal memory. This would defeat the purpose

of security. At the same time, the user may also wish to put a backdoor in the application program. An

example of this is the user downloads a security key through the SCI, which allows access to a

programming routine that updates parameters stored in another section of the Flash memory.

The security features of the S12X chip family (in secure mode) are:

Freescale Semiconductor

Protect the contents of non-volatile memories (Flash, EEPROM)

Execution of NVM commands is restricted

Disable access to internal memory via background debug module (BDM)

Disable access to internal Flash/EEPROM in expanded modes

Disable debugging features for CPU and XGATE

Introduction

gives an overview over availability of security relevant features in unsecure and secure modes.

MC9S12XDP512 Data Sheet, Rev. 2.21