/* PROGRAM FOR BLINKING LEDs CONEECTED TO PORT-D */

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1 /* PROGRAM FOR BLINKING LEDs CONEECTED TO PORT-D */ CONFIG _CP_OFF & _WDT_OFF & _BODEN_OFF & _PWRTE_ON & _HS_OSC & _WRT_OFF & _LVP_OFF & _CPD_OFF ;***** VARIABLE DEFINITIONS COUNT_L EQU 0x01 ;********************************************************************** ORG 0x000 ; processor reset vector goto ; go to beginning of program ORG 0x004 ; interrupt vector location retfie ; return from interrupt ;Setting the Direction of PORTD START banksel TRISD ;Select Bank 1, Since TRISD is in bank 1 ;Set the PORTD direction as Output ;by writing 00h in TRISD ;Passing the Data to PORTD to Flash LED banksel PORTD MOVLW b' ' LED CALL DELY1 MOVLW b' ' LED CALL DELY1 ;Load value in PORTD to Turn OFF the ;OFF period ;Load value in PORTD to Turn OFF the ;Simple procedure for Delay DELY1 MOVLW 0F MOVWF COUNT_L LOOP1 DECFSZ COUNT_L,F GOTO LOOP1 RETURN ; directive 'end of program' 1

2 /* PROGRAM FOR RUNNING LEDs CONEECTED TO PORT-D */ CONFIG _CP_OFF & _WDT_OFF & _BODEN_OFF & _PWRTE_ON & _HS_OSC & _WRT_OFF & _LVP_OFF & _CPD_OFF ;***** VARIABLE DEFINITIONS COUNT_L EQU 0x72 ;************************************************************ ORG 000H goto ORG 004H retfie banksel TRISD banksel PORTD 1 MOVLW 01H RLF PORTD,1 BTFSS PORTD,7 1 ; skipping this condition will make Port D clear for unit time ; for use with BTFSS PORTD,7 ;Simple procedure for Delay DELAY MOVLW 0F MOVWF COUNT_L LOOP1 DECFSZ COUNT_L,F GOTO LOOP1 RETURN ; directive 'end of program' 2

3 /* PROGRAM FOR READING THE KEY PRESS */ CONFIG _CP_OFF & _WDT_OFF & _BODEN_OFF & _PWRTE_ON & _HS_OSC & _WRT_OFF & _LVP_OFF & _CPD_OFF ORG 0x000 ; processor reset vector ; Select BANK 1 banksel TRISB ; Configure portb as input MOVLW 0FFH MOVWF TRISB ; Configure RD0 as output MOVLW 0FEH ; Select BANK 0 banksel PORTB LOOP BTFSS PORTB, 0 GOTO LED_ON GOTO LED_OFF LED_ON BSF PORTD, 0 GOTO LOOP LED_OFF BCF PORTD, 0 GOTO LOOP ; directive 'end of program' 3

4 /* PROGRAM FOR SQUARE WAVE GENERATION USING TIMER0 */ list p=16f877a #include <P16f877A.inc> COUNT EQU 0X01 ORG 00H GOTO MAIN ORG 004H RETFIE MAIN START ;Select Bank1 BANKSEL TRISB ;Configure PORTB as output MOVLW 0X00 MOVWF TRISB ;Configure the option register ;Prescaler assigned to TIMER0, prescale is 1:256 MOVLW 0X07 MOVWF OPTION_REG ;Select Bank0 BANKSEL PORTB REPEAT MOVLW 0X0F MOVWF COUNT ;Wait for T0IF flag BTFSS INTCON,T0IF ;Clear the T0IF flag and then continue BCF INTCON, T0IF DECFSZ COUNT ;Complement the pins of PORTB COMF PORTB GOTO REPEAT 4

5 /* PROGRAM FOR EXTERNAL INTERRUPT */ CONFIG _CP_OFF & _WDT_OFF & _BODEN_ON & _PWRTE_ON & _HS_OSC & _WRT_OFF & _LVP_OFF & _CPD_OFF ;***** VARIABLE DEFINITIONS COUNT EQU 0x00 ; variable used for context saving COUNT_L EQU 0x72 COUNT_H EQU 0x73 COUNT_H1 EQU 0x74 ;********************************************************************** ORG 0x000 ; processor reset vector goto ; go to beginning of program ORG 0x004 ; interrupt vector location goto isr ; return from interrupt start ;Select Bank1 banksel TRISD ;Configure PORTD as output ;Interrupt on falling edge on RB0/INT pin BCF OPTION_REG,6 ;configure RB3:RB0 as input MOVLW 0FH MOVWF TRISB ;Select PORT 0 BANKSEL PORTB ;Set RD0 pin MOVLW 01H ;Configure INTCON register (Enable Global & INT interrupts) MOVLW 0x90 MOVWF INTCON goto isr BCF INTCON,INTF CLRF PORTD 5

6 LOOP MOVLW 03H MOVWF COUNT MOVLW 02H DELAY LOOP3 LOOP2 LOOP1 DECFSZ COUNT,F GOTO LOOP retfie MOVLW 03FH MOVWF COUNT_H1 MOVLW 0FFH MOVWF COUNT_H MOVLW 0FH MOVWF COUNT_L DECFSZ COUNT_L,F GOTO LOOP1 DECFSZ COUNT_H,F GOTO LOOP2 DECFSZ COUNT_H1,F GOTO LOOP3 RETURN ; loop till counter_l is zero 6

7 /* PROGRAM FOR CLEARING THE MEMORY LOCATIONS */ CONFIG _CP_OFF & _WDT_OFF & _BODEN_OFF & _PWRTE_ON & _HS_OSC & _WRT_OFF & _LVP_OFF & _CPD_OFF ORG 000H GOTO ORG 004H RETFIE START ;Load the FSR register with 20H MOVLW 20H MOVWF FSR ;clear the location pointed by FSR CLRF INDF ;Increment the pointer by 1 INCF FSR ;Check the upper limit reached or not BTFSS FSR,4 GOTO $ 7

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