PIC18F46J11 datasheet(56/528 Pages) MICROCHIP

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PIC18F46J11 FAMILY

DS39932C-page 56

EXAMPLE 3-1:

ULTRA LOW-POWER WAKE-UP INITIALIZATION

//*********************************************************************************

//Configure a remappable output pin with interrupt capability

//for ULPWU function (RP21 => RD4/INT1 in this example)

//*********************************************************************************

RPOR21 = 13;// ULPWU function mapped to RP21/RD4

RPINR1 = 21;// INT1 mapped to RP21 (RD4)

//***************************

//Charge the capacitor on RA0

//***************************

TRISAbits.TRISA0 = 0;

PORTAbits.RA0 = 1;

for(i = 0; i < 10000; i++) Nop();

//**********************************

//Stop Charging the capacitor on RA0

//**********************************

TRISAbits.TRISA0 = 1;

//*****************************************

//Enable the Ultra Low Power Wakeup module

//and allow capacitor discharge

//*****************************************

WDTCONbits.ULPEN = 1;

WDTCONbits.ULPSINK = 1;

//******************************************

//For Sleep,

Enable Interrupt for ULPW.

//******************************************

INTCON3bits.INT1IF = 0;

INTCON3bits.INT1IE = 1;

//********************

//Configure Sleep Mode

//********************

//For Sleep

OSCCONbits.IDLEN = 0;

//For Deep Sleep

OSCCONbits.IDLEN = 0;// enable deep sleep

DSCONHbits.DSEN = 1;// Note: must be set just before executing Sleep();

//****************

//Enter Sleep Mode

//****************

Sleep();

// for sleep, execution will resume here

// for deep sleep, execution will restart at reset vector (use WDTCONbits.DS to detect)

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