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1 Introduction

The Kinetis family of microcontrollers include system security

and flash protection features that can be used to protect code

and data from unauthorized access or modification. This

application note discusses usage of the security and flash

protection features available on the Kinetis family processors.

The chip security and flash protection features controlled

using the flash configuration field will be covered in this

application note.

The default security options are configured at reset based on

the application image. All flash application images need to

include configuration of the security and protection options.

Configuration is required in all cases. Even if the required

setting is to have the flash and security options disabled, the

application image must configure the setting for those desired

values. Therefore, anyone writing an application must be

aware of the security and protection options and how to

correctly configure them.

2 Security vs. protection

The Kinetis security features are system-level options that are

designed to prevent unauthorized access to the processor and

the code and data within the processor. Software intellectual

Freescale Semiconductor

Document Number:AN4507

Application Note

Rev. 1, 6/2012

Using the Kinetis Security and

Flash Protection Features

by:

Melissa Hunter

Automotive and Industrial Solutions Group

General Business Information

Contents

1 Introduction................................................................1

2 Security vs. protection...............................................1

2.1 Security options.............................................2

3 Flash protection.......................................................10

3.1 Flash protection regions...............................10

3.2 Configuring flash protection

settings.........................................................11

3.3 Changing flash protection

settings.........................................................11

4 Tamper detection and cryptography........................12

property (IP) is a very valuable investment and the security features protect that investment, prevent cloning, and secure

sensitive data that might be stored in the memory.

• Security feature: Although the security on Kinetis is controlled by the settings that reside within the flash, it is not a

flash-level feature. The flash provides the security options to the chip system logic, and the chip system logic takes

action based on the settings. So, even though the user interacts with the flash to use the security settings, it must be

considered as a processor mode selection because the decisions made by the user will affect the entire processor. In

fact, the option to enable or disable security has very little impact on the flash itself. Even when the security is enabled,

the flash is still fully operational. This means that firmware residing in the flash that enables security can still modify

the flash because read, erase, and program operations to the flash itself are not changed (with the possible exception of

mass erase).

• Flash protection feature: By comparison, the flash protection features only affect the flash itself. The flash protection is

designed to prevent accidental erasure or programming of areas of the flash. This option only affects the ability to

modify selected flash regions; there is no effect on the rest of the processor.

2.1 Security options

The following sections will show the security options that are available on Kinetis. Initially, look at the actual register and

field descriptions from the Kinetis reference manual available on http://www.freescale.com, then go into more detail on how

each option works and how to configure them.

2.1.1 FSEC register and field settings

The Flash Security (FSEC) register contains several fields that are used to enable/disable security and also select a few

features that come into effect when security is enabled. Figure 1 shows the FSEC register fields, and Table 1 shows the bit

settings for each of the fields. The following sections discuss all of the options available in the FSEC register in more detail

including impact on the system and recommended usage.

Figure 1. Flash Security register

Table 1. FSEC field description

Field Description

7–6

KEYEN

Backdoor Key Security Enable.

This field enables and disables backdoor key access to

the flash memory module.

00 Backdoor key access is disabled.

01 Backdoor key access is disabled (preferred

KEYEN state to disable backdoor key access)

10 Backdoor key access is enabled.

11 Backdoor key access is disabled.

Table continues on the next page...

Security vs. protection

Using the Kinetis Security and Flash Protection Features, Rev. 1, 6/2012

2 Freescale Semiconductor, Inc.

General Business Information

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