1.34.21 Supply Controller (SUPC)

The Supply Controller controls the Embedded Voltage Regulators used by the Core Power Supply and Backup Low Power Mode.

In Backup Low Power Mode the current consumption is reduced to a few microamps for Backup power retention. Exit from this mode can be achieved via multiple wake-up sources.

The Supply Controller also generates the Slow Clock (SCLK) by selecting either the 22-42kHz Low Power RC oscillator or the 32kHz Low Power Crystal oscillator.

The purpose of Backup Low Power Mode is to achieve the lowest power consumption possible in a system that wakes up periodically in order to perform tasks that do not require a fast startup time.

The supply controller, zero-power power-on reset, RTT, RTC, backup registers, and 32kHz oscillator (RC or crystal oscillator selected by software) are all running whilst the regulator and core supply are off.

Following wakeup sources can wakeup the device from backup mode.

• 14 Wakeup Inputs with Programmable Debouncing

• Real-Time Clock Alarm

• Real-Time Timer Alarm

• Supply Monitor Detection on VDDIO, with Programmable Scan Period and Voltage Threshold

while(1)
{
    switch(cmd)
    {
        case SLEEP_MODE:
        {
            SUPC_SleepModeEnter();
            break;
        }
        case WAIT_MODE:
        {
            SUPC_WaitModeEnter(PMC_FSMR_FLPM_FLASH_DEEP_POWERDOWN, WAITMODE_WKUP_WKUP7);
            break;
        }
        case BACKUP_MODE:
        {
            SUPC_BackupModeEnter();
            break;
        }
    }
}