MM912H634CV1AE Freescale Semiconductor, MM912H634CV1AE Datasheet - Page 230

• Manufacturer Part Number: MM912H634CV1AE
• Description: 64KS12 LIN2xLS/HS Isense
• Manufacturer: Freescale Semiconductor
• Series: -r

Specifications of MM912H634CV1AE

• Applications: Automotive
• Core Processor: HCS12
• Program Memory Type: FLASH (64 kB)
• Controller Series: HCS12
• Ram Size: 6K x 8
• Interface: LIN
• Number Of I /o: -
• Voltage - Supply: 5.5 V ~ 27 V
• Operating Temperature: -40°C ~ 105°C
• Mounting Type: Surface Mount
• Package / Case: 48-LQFP Exposed Pad
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

4.33
4.33.1
This specification describes the function of the security mechanism in the S12I chip family (9SEC).
4.33.1.1
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 S12I chip family (in secure mode) are:
4.33.1.2
Table 332
Figure 84
Freescale Semiconductor
Note:
180.
181.
•
•
•
Restricted NVM command set only. Please refer to the NVM wrapper block guides for detailed information.
BDM hardware commands restricted to peripheral registers only.
Protect the content of non-volatile memories (Flash, EEPROM)
Execution of NVM commands is restricted
Disable access to internal memory via background debug module (BDM)
shows all modules affected by security in an MCU.
gives an overview over availability of security relevant features in unsecure and secure modes.
Security (S12X9SECV2)
Introduction
Features
Modes of Operation
No security feature is absolutely secure. However, Freescale’s strategy is to make reading
or copying the FLASH and/or EEPROM difficult for unauthorized users.
Table 332. Feature Availability in Unsecure and Secure Modes on S12I
NS
SS
MM912_634 Advance Information, Rev. 4.0
Unsecure Mode
NX
ES
NOTE
EX
ST
NS
SS
Secure Mode
NX
ES
EX
ST
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