AN2633 datasheet(18/48 Pages) STMICROELECTRONICS

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STR91xFA library low power mode functions

AN2633

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STR91xFA library low power mode functions

2.1

SCU_MCLKSourceConfig

MCLK_Source

To select the system clock, use one of the following values:

Function name

SCU_MCLKSourceConfig

Function prototype

ErrorStatus SCU_MCLKSourceConfig(u32 MCLK_Source)

Behavior description

Selects the MCLK clock source: OSC, RTC, or PLL

Input parameter

MCLK_Source: specifies the clock source used as system

clock. Refer to Table 3: MCLK source for the allowed values.

Output parameter

None

Return parameter

ErrorStatus: ERROR or SUCCESS.

Function returns ERROR when selecting the PLL clock as

MCLK source while PLL is either disabled or not locked.

Required preconditions

When selecting the PLL as MCLK clock source, make sure that

the PLL is enabled and locked, you can do this using the

SCU_PLLCmd(ENABLE) function.

Called functions

None

Required preconditions

When selecting the PLL as MCLK clock source, make sure that

the PLL is enabled and locked, you can do this using the

SCU_PLLCmd(ENABLE) function.

Called functions

None

Required preconditions

When selecting the PLL as MCLK clock source, make sure that

the PLL is enabled and locked, you can do this using the

SCU_PLLCmd(ENABLE) function.

Called functions

None

Table 3.

MCLK source

MCLK_Source

Meaning

SCU_MCLK_PLL

MCLK source = PLL clock

SCU_MCLK_RTC

MCLK source = RTC clock

SCU_MCLK_OSC

MCLK source = Oscillator clock

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