UM0097 datasheet(19/229 Pages) STMICROELECTRONICS

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UM0097

Peripheral firmware overview

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Voltage regulator status

The following enumeration defines the states of the voltage regulator. The VR_Status

enumeration is defined in the file 71x_pcu.h:

typedef enum

{

PCU_STABLE,

PCU_UNSTABLE

} PCU_VR_Status;

Table 5 describes the status of PCU voltage regulator.

PCU voltage regulators

The following enumeration defines the power control unit voltage regulators. The PCU_VR

enumeration is declared in the file 71x_pcu.h:

typedef enum

{

PCU_MVR = 0x0008,

PCU_LPR = 0x0010

} PCU_VR;

Table 6 describes the PCU voltage regulators.

WFI clocks

The following enumeration defines the WFI mode clocks. WFI_CLOCKS enumeration is

declared in the file 71x_pcu.h:

typedef enum

{

WFI_CLOCK2_16,

WFI_Ck_AF

} WFI_CLOCKS;

Table 7 lists the different WFI Clocks.

Table 5.

PCU voltage regulator status

Regulator State

Description

PCU_STABLE

The Main Voltage Regulator is stable and can be used to power the device.

PCU_UNSTABLE

The Main Voltage Regulator is not yet stable

Table 6.

PCU voltage regulator descriptions

Voltage Regulators

Description

PCU_MVR

The Main Voltage Regulator

PCU_LPR

The Low Power Voltage Regulator

Table 7.

WFI clocks

WFI Clocks

Description

WFI_CLOCK2_16

CLOCK2/16 clock is selected during LPWFI

WFI_Ck_AF

The RTC clock is selected during LPWFI

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