UM0097 datasheet(25/229 Pages) STMICROELECTRONICS

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UM0097

Peripheral firmware overview

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PCU_LPModesConfig

Example:

This example disables the PLL1 automatically when CK_AF is selected is selected as

source clock, puts the FLASH in PWD mode, disables the MVR during STOP and WFI

mode, enables low power mode during WFI mode (LPWI) and selects CK_AF as source

clock during LPWFI mode.

{

/* User code */

/* Set the MVR disabled and the FLASH in PWD mode during STOP

mode */

PCU_LPModesConfig(DISABLE,DISABLE,DISABLE,ENABLE,LPWFI_CK_AF);

|_CK_AF is selected during LPWFI

|_Enable Low power mode during WFI mode

|_FLASH in powerdown during LPWFI and STOP modes

|_MVREG is disabled during LPWFI and STOP modes

|_PLL1 is disabled automatically when CK_AF is selected */

/* User code */

Function Name

PCU_LPModesConfig

Function Prototype

void PCU_LPModesConfig (FunctionalState PLL1_State,

FunctionalState MVR_State,FunctionalState

FLASH_State, FunctionalState

LPWFI_State,LPWFI_Clock_Typedef LPWFI_Clock);

Behavior Description

This routine configures the different STR71x low power mode options.

Input Parameter 1

PLL1_State: the state of PLL1 when CK_AF selected.

– ENABLE: PLL1 is not disabled when CK_AF is selected

– DISABLE: PLL1 is disabled automatically when CK_AF is selected as

system clock

Input Parameter 2

MVR_State: the state of the Main Voltage Regulator when CK_AF is

selected.

– ENABLE: MVREG is enabled during LPWFI and STOP modes

– DISABLE: MVREG is disabled during LPWFI and STOP modes

Input Parameter 3

FLASH_State: the state of the flash during LPWFI and STOP modes.

– ENABLE: Flash Stand-by mode during LPWFI and STOP modes

– DISABLE: FLASH in powerdown during LPWFI and STOP modes

Input Parameter 4

LPWFI_State: the state of low power mode during LPWFI.

– ENABLE: Enable Low power mode during WFI mode

– DISABLE: Disable Low power mode disabled during WFI mode

Input Parameter 5

LPWFI_Clock: the selected clock during LPWFI.

– LPWFI_CLK2_16: CLK2/16 is selected during LPWFI

– LPWFI_CK_AF: CK_AF is selected during LPWFI

Output Parameter

None

Return Value

None

Required preconditions

None

Called Functions

None

UM0097 Datasheet(PDF) 25 Page - STMicroelectronics

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