ST-LINK utility

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You can download the application ST-Link from http://www.st.com and make a search for ST-Link utility.

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Option Bytes

Once a MCU has been programmed with its final software, it may be protected against 
piracy by forbidding any further read-out of its contents.
For this purpose, MCU have Option Bytes to protect memory areas,but also to enable 
Watchdog,... Option bytes loading process starts during the start process of the 
MCU.
The Option Bytes are in regular Flash memory bytes but does not pertain to the regular 
Flash program memory array of the MCU.
As such, it is accessible in read and write mode by means of a separate procedure, 
which depends on the software and hardware tool used for programming the MCU and is 
completely independent of the other program memory array.
Article : 2004NOV30_MPR_AN07

Assuming that you have already connected to the target, go to Target menu, and select
Option  Bytes...

You will get all the option bytes for the current connected microcontroller.

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