UM0097 datasheet(33/229 Pages) STMICROELECTRONICS

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UM0097

Peripheral firmware overview

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Table 15 lists the different values of the PLL division factor.

USB clock source

The following enumeration defines the USB clock sources. USB_Clocks enumeration is

defined in the file 71x_rccu.h:

typedef enum

{RCCU_PLL2_Output = 0x01,

RCCU_USBCK = 0x00

} RCCU_USB_Clocks;

Table 16 describes the USB clock sources.

RCCU internal clocks

The following enumeration defines the RCCU internal clocks. RCCU_Clocks enumeration is

defined in the file 71x_rccu.h:

typedef enum

{RCCU_CLK2,

RCCU_RCLK,

RCCU_MCLK,

RCCU_PCLK2,

RCCU_PCLK1

} RCCU_Clocks;

Table 15.

PLL division factors

PLL Division factor

Description

RCCU_Div_1

Division factor equal to 1

RCCU_Div_2

Division factor equal to 2

RCCU_Div_3

Division factor equal to 3

RCCU_Div_4

Division factor equal to 4

RCCU_Div_5

Division factor equal to 5

RCCU_Div_6

Division factor equal to 6

RCCU_Div_7

Division factor equal to 7

Table 16.

USB clock sources

USB Clock Source

Description

RCCU_PLL2_Output

Select the PLL2 output as USB clock source

RCCU_USBCK

Select the USBCK as USB clock source

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