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| Setting Tool Options µVision3 lets you set options for your target hardware. The dialog Options for Target opens via the toolbar icon or via the Project — Options for Target menu item. In the Target tab you specify all relevant parameters of your target hardware and the on-chip components of the device you have selected. The following dialog shows the settings for our example.

The following table describes the options of the Target dialog: | Dialog Item | Description |
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| Xtal | specifies the external clock frequency of your device. Several microcontrollers use an on-chip PLL to generate the CPU clock. In this cases the value is not identical with the XTAL frequency. Check your hardware design carefully to determine the correct value. | | Operating System | allows you to select a Real-Time Operating System for your project. | Use On-chip ROM / RAM | defines the address spaces for the on-chip memory components for the linker/locater. Note that on some devices you need to reflect this configuration in the Startup Code. |
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