Code vi xử lý 16f877a đếm sản phẩm 00-99

PROCESSOR 16F877A

#INCLUDE
__CONFIG _CP_OFF & _WDT_OFF & _BODEN_OFF & _PWRTE_ON & _XT_OSC & _WRT_OFF & _LVP_OFF & _CPD_OFF
DONVI EQU 20H
CHUC EQU 21H
DEM EQU 23H
ORG 0000H

          BCF STATUS,6
          BSF STATUS,5
          MOVLW B'11110000'
          MOVWF TRISB
          BCF TRISD,0
          BCF TRISA,0
          BCF TRISA,1
          BSF TRISA,2
          BCF STATUS,5
          CLRF PORTA
          CLRF PORTB
          CLRF PORTD
          MOVLW D'0'
          MOVWF DONVI
          MOVLW D'0'
          MOVWF CHUC

MAIN         

          MOVF DONVI,W
          MOVWF PORTB
          MOVLW B'11111110'
          MOVWF PORTA
          CALL DELAY
          MOVF CHUC,W
          MOVWF PORTB
          MOVLW B'11111101'
          MOVWF PORTA
          CALL DELAY

BATDAUDEM

          BTFSS PORTB,6
          GOTO KT
          GOTO MAIN
KT
          BTFSS PORTB,6
          GOTO BATDAUDEM
          INCF DONVI,1
          MOVLW D'10'
          XORWF DONVI,0
          BTFSS STATUS,2
          GOTO BATDAUDEM
LOOP
          CLRF DONVI
          INCF CHUC,1
          MOVLW D'10'
          XORWF CHUC,0
          BTFSS STATUS,2
          GOTO BATDAUDEM
          CLRF CHUC
          BSF PORTD,0
          GOTO BATDAUDEM

DELAY
          BSF STATUS,5
          BCF STATUS,6
          BCF OPTION_REG,3
          BCF OPTION_REG,2
          BCF OPTION_REG,1
          BSF OPTION_REG,0
          BCF STATUS,5
          MOVLW D'20'
          MOVWF DEM
BATDAU
          MOVLW D'130'
          MOVWF TMR0
          BSF STATUS,5
          BCF OPTION_REG,5
          BCF STATUS,5
LOOP1
          BTFSS INTCON,2
          GOTO LOOP1
          BCF INTCON,2
          DECFSZ DEM,1
          GOTO BATDAU
 

RETURN

END

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