UM0225 datasheet(20/57 Pages) STMICROELECTRONICS

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3 Designing with CAPS

UM0225

19/56

Figure 11. LVD Voltage tab

Click either the 2.4V or 2.7V LVD threshold radio button, as applicable.

3.3

Specifying the clock source and frequency

Click the Clocks tab for the following clocking options.

•

Specify the clock source and master clock frequency.

•

Specify the clock divisors.

•

Save clock settings in a C-header file.

Note:

The clock settings affect the Hardware Abstraction Layer (HAL) library so the capability is

provided to produce a C-header file to be included in your source code.

The following subsections discuss the clock configuration options in more detail.

3.3.1

Selecting the clock source and frequency

There are three clock source options available.

•

Main oscillator input clock (OSC)

•

PLL clock

•

RTC clock

Which clock source is selected affects which other clock configuration options are available.

Clicking the radio button associated with the desired clock source automatically displays the

configurable parameters, as describe below.

Note:

Typical system values are displayed as default values in the following dialogs.

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