1.8.20 Supply Controller (SUPC)

The Supply Controller (SUPC) controls the supply voltages of the system. The SUPC also generates the slow clock by selecting either the low-power RC oscillator or the low-power crystal oscillator.

Using The Library

SUPC Peripheral library provides API's and they can be used to perform below functionalities.

To put the device either in Sleep, Backup or Wait mode.
To read and write the General Purpose Backup Register (GPBR).
Generate supply monitor callback to save critical data to prepare the system for a power down. Supply monitor can generate interrupt or Reset the device when supply voltage crosses below the specified threshold level.

The examples shows the code to enter sleep, backup and wait mode.

while(1)
{
    switch(cmd)
    {
        case SLEEP_MODE:
        {
            SUPC_SleepModeEnter();
            break;
        }
        case WAIT_MODE:
        {
            SUPC_WaitModeEnter(PMC_FSMR_FLPM_FLASH_DEEP_POWERDOWN, WAITMODE_WKUP_RTC);
            break;
        }
        case BACKUP_MODE:
        {
            SUPC_BackupModeEnter();
            break;
        }
    }
}

Library Interface

Supply Controller peripheral library provides the following interfaces:

Functions


Name	Description
SUPC_Initialize	Initializes SUPC x module of the device
SUPC_SleepModeEnter	Puts the device into Sleep mode
SUPC_WaitModeEnter	Puts the device into Wait mode
SUPC_BackupModeEnter	Puts the device into Backup mode
SUPC_GPBRRead	Reads the data from General Purpose Backup Register(GPBR)
SUPC_GPBRWrite	Writes data to the General Purpose Backup Register(GPBR)
SUPC_CallbackRegister	Allows application to register callback with PLIB

Data types and constants


Name	Type	Description
WAITMODE_WKUP_SOURCE	Enum	Identifies the wakeup input source
WAITMODE_FLASH_STATE	Enum	Identifies Flash Low-power mode
GPBR_REGS_INDEX	Enum	GPBR registers index
SUPC_CALLBACK	Typedef	Pointer to a SUPC callback function