PIC18F458 single-chip microcomputer sleep state working mode and activation

/*This program implements the sleep mode of PIC18F458, and activates it from sleep mode by generating "level change interrupt" by the key on the experimental board. The sleep and active states are displayed by 8 LEDs connected to port D. When in sleep mode, the high 4
LEDs light up and the low 4 LEDs turn off; after activation, the high 4 LEDs turn off and the low 4 LEDs light up*/

#include "p18f458.h"

unsigned long    i;

/*System initialization subroutine*/
void initial()
{
INTCON=0x08; /*Global interrupt disabled, "level change interrupt" only performs wake-up function*/
/*Clear B port level change interrupt flag*/
TRISA=0x00; /*Port A is set to output*/
TRISB=0XF0; /*RB1 output, RB4 input*/
TRISD=0X00; /*Port D is output*/
TRISE=0x00; /*Port E is set to output*/
PORTBbits.RB1=0;
PORTAbits.RA3=0;
PORTE=0; /*Set K1, K2, K3, K4 four column lines to 0*/
PORTB=PORTB; /*Read the value of PORTB, latch the old value, and prepare for "level change
interrupt"*/
}

void SLEEP()
{
_asm
SLEEP /*Enter sleep state*/
_endasm
}

/*Main program*/
main ()
{
initial(); /*Initialization*/
PORTD=0X0F; /*The upper 4 LEDs are on*/
SLEEP(); /*The MCU starts to enter sleep mode*/
PORTD=0XF0; /*After activation, the lower 4 LEDs are on*/
while(1)
{
;
}

}
Complete!
-----------PIC18F458 MCU sleep mode and activation written in assembly language-----------------------
;This program implements the sleep mode of PIC18F458,
;http://www.51hei.com This program has been tested with the MCU experiment board of this site
; and the "level change interrupt" generated by the button on the experiment board activates it from the sleep state.

LIST  P=18F458
INCLUDE  "P18F458.INC"

COUNT EQU  0X20

ORG  0X00
GOTO MAIN
ORG  0X30

;************Display subroutine****************
DISPLAY
CLRF PORTA
MOVWF SSPBUF
LOOP NOP
BTFSS PIR1，SSPIF
GOTO LOOP
NOP
BCF PIR1，SSPIF
BSF PORTA，5 ;For detailed program statements, please refer to Section 3. 1. 3
RETURN

;**********Initialization subroutine*************
INITIAL
BCF INTCON, GIE ;Global interrupt disabled, "level change interrupt" only executes wake-up function
BSF INTCON, RBIE ;PORTB level change interrupt enabled
BCF INTCON, RBIF ;Clear B port level change interrupt flag
BCF TRISA, 5 ;Set RA5 to output mode to output latch signal
BCF TRISB, 1
BCF TRISA, 3
BCF TRISE, 0
BCF TRISE, 1
BSF TRISB, 4 ;Set the input and output mode of each port related to the keyboard
BCF TRISC, 5
BCF TRISC, 3 ;Set SCK and SDO to output mode
MOVLW 0XC0
MOVWF SSPSTAT ;Set SSPSTAT register
MOVLW 0X30
MOVWF SSPCON1 ;Set the SPI control mode, allow SSP mode, and send on the falling edge of the clock , which corresponds to the characteristic of "
when the SCLK of 74HC595 jumps from low to high, the serial input data (DI) is moved into the register" BCF PORTB, 1 BCF PORTA, 3 BCF PORTE, 0 BCF PORTE, 1 ;Set the four column lines K1, K2, K3, and K4 to 0 to create the initial conditions for the generation of level change interrupts RETURN ;Return

;****************************************
MAIN NOP
CALL INITIAL ;Initialize
MOVLW 0X08
MOVWF COUNT
MOVLW 0XFF ;"FF" is the display segment code of "DARK"
NEXT1
CALL DISPLAY ;Before sleep mode, all 8 LEDs display "DARK"
DECF COUNT, 1
BTFSS STATUS, Z
GOTO NEXT1
SLEEP ;PIC16F877 enters "sleep mode"
NOP
MOVLW 0X08
MOVWF COUNT
MOVLW 0X90 ;"90" is the display segment code of "9"
NEXT
CALL DISPLAY ;After waking up from sleep mode, display 8 characters "9"
DECF COUNT, 1
BTFSS STATUS, Z
GOTO NEXT
NOP
END