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#include "P16F877A.inc"
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temp EQU 0x20 ;temp variable
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CLRWDT ;clear the watch dog timer
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;watch dog timer restart the program if it overflowed
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call init_port_d_output
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;The first three pins as output
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movlw b'00001111' ;Digital mode for port E
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movwf ADCON1 ;read page 114 of the datasheet
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bcf TRISE,RS ;initialize pin0 to output
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bcf TRISE,RW ;initialize pin1 to output
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bcf TRISE,E ;initialize pin2 to output
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;PORTD will be used as an input to the LCD data bus
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bsf STATUS,5 ;choose bank 01
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bcf STATUS,6 ;RP0,RP1 from status =01m
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;PORTD will be used as an input to read the LCD status
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movlw 0xFF ;make PORTD as input
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call init_port_d_output
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call busy_LCD ;check if the LCD busy
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bcf PORTE,RW ;R/W -->0
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;check if the LCD is busy
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call init_port_d_input ; to read the LCD status
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movf PORTD,W ;flag busy ?
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;send a char to the LCD
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;the char must be stored in working register
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movwf temp ;moving the WREG contents to a temp variable
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;WREG will be overwritten
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call busy_LCD ;check if the LCD busy
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call init_port_d_output
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bsf PORTE,RS ;control signals
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movf temp,W ;sending the stored character to PORTD
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call init_port_d_output
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call init_port_d_output
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movlw b'00111100' ;b3=1-> 2-line mode
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movlw b'00001111' ;b2=1-> Display on
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movlw b'00000111' ;b1=1-> increment on
b'\\ No newline at end of file'
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cocktail/LCD_pic16f877/project.asm
