AN2633 datasheet(19/48 Pages) STMICROELECTRONICS

Part #	AN2633

Description	STR91xFA low power management and power consumption

PDF	48 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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19 / 48 page

AN2633

STR91xFA library low power mode functions

19/48

2.2

SCU_PLLCmd

After enabling the PLL, the PLL lock bit is polled to ensure that the PLL is locked before

exiting the function.

Before disabling the PLL a “security” delay is inserted, this to guarantee that the system

clock has already switched to OSC or RTC before disabling the PLL.

Function name

SCU_PLLCmd

Function prototype

ErrorStatus SCU_PLLConfig(FunctionnalState NewState)

Behavior description

Enables or disables the PLL

Input parameter

NewState: ENABLE or DISABLE

Output parameter

None

Return parameter

ErrorStatus: ERROR or SUCCESS

The function returns ERROR when:

– Disabling the PLL while PLL is selected as MCLK source

– Enabling the PLL while PLL already enabled & locked

Required preconditions

– When enabling the PLL, you must have already configured the PLL

factors using the SCU_PLLFactorsConfig function.

– When disabling the PLL, make sure that the PLL is not selected as

MCLK.

Called functions

None

AN2633 Datasheet(PDF) 19 Page - STMicroelectronics