UM0225 datasheet(33/57 Pages) STMICROELECTRONICS

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3 Designing with CAPS

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Firmware Placement

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OTP Setting

These are discussed in detail in the following subsections.

At the bottom of the form is a Description window. This window displays useful information

corresponding to the current cursor location in any data entry window on the form. Click the

cursor in a data entry window to see the description for that window.

After completing all desired Configuration form entries, click the Apply button at the bottom of

the form to regenerate a new programming data file for the design.

3.6.1

Setting security

Setting the security bit blocks all access to the content of the device by means of JTAG or a

conventional programmer. Once the security bit is set, reading or copying the configuration or

memory contents of the device is disabled.

In the Security dialog, click the Enable security bit checkbox to enable security. Uncheck the

box do disable security.

Note:

The only way to override the security bit is to erase the entire device.

3.6.2

Power-up boot flash selection

This option, in the Boot Flash dialog, allows you to select the flash from which the CPU boots at

power up. Click the desired radio button to select either main flash or secondary flash.

3.6.3

Setting a JTAG/ISP user code

This option, in the JTAG/ISP dialog, allows you to enter a 32-bit code, which can be used for

various functions, such as programming-contents and revision-level identification.

Enter the JTAG/ISP User Code on the Configuration form, entering any 32-bit hexadecimal

value. The default value is FFFFFFFF.

3.6.4

Setting sector protection

Individual NVM segments within the device may be statically write-protected to prevent

accidental data loss.

Click the checkbox for the sector you wish to write-protect. Uncheck the box to disable

protection. Protection granularity is eight sectors in Main Flash and four sectors in Secondary

Flash.

3.6.5

Firmware placement

The firmware file may be located in main or secondary flash memory.

In the Firmware Placement dialog, enter the start and end hexadecimal addresses and the

firmware filename for the desired flash area.

3.6.6

Setting OTP programmable memory bytes

The OTP Settings dialog allows you to write values to and lock programmable memory.

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