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movc a,@a+dptr
jz DATA_FINISHED
acall SEND_DATA
clr a
inc dptr
sjmp DATA_LOOP
DATA_FINISHED:
sjmp $
CONFIGURE_LCD: ;THIS SUBROUTINE SENDS THE INITIALIZATION COMMANDS TO THE LCD
mov a,#38H ;TWO LINES, 5X7 MATRIX
acall SEND_COMMAND
mov a,#0FH ;DISPLAY ON, CURSOR BLINKING
acall SEND_COMMAND
mov a,#06H ;INCREMENT CURSOR (SHIFT CURSOR TO RIGHT)
acall SEND_COMMAND
mov a,#01H ;CLEAR DISPLAY SCREEN
acall SEND_COMMAND
mov a,#80H ;FORCE CURSOR TO BEGINNING OF THE FIRST LINE
acall SEND_COMMAND
ret
;P1.0-P1.7 ARE CONNECTED TO LCD DATA PINS D0-D7
;P3.5 IS CONNECTED TO RS
;P3.6 IS CONNECTED TO R/W
;P3.7 IS CONNECTED TO E
SEND_COMMAND: ;THIS SUBROUTINE IS FOR SENDING THE COMMANDS TO LCD
mov p1,a ;THE COMMAND IS STORED IN A, SEND IT TO LCD
clr p3.5 ;RS=0 BEFORE SENDING COMMAND
clr p3.6 ;R/W=0 TO WRITE
setb p3.7 ;SEND A HIGH TO LOW SIGNAL TO ENABLE PIN
acall DELAY
clr p3.7
ret
SEND_DATA: ;THIS SUBROUTINE IS FOR SENDING THE DATA TO BE DISPLAYED
mov p1,a ;SEND THE DATA STORED IN A TO LCD
setb p3.5 ;RS=1 BEFORE SENDING DATA
clr p3.6 ;R/W=0 TO WRITE
setb p3.7 ;SEND A HIGH TO LOW SIGNAL TO ENABLE PIN
acall DELAY
clr p3.7
ret
DELAY: ;A SHORT DELAY SUBROUTINE
push 0
push 1
mov r0,#50
DELAY_OUTER_LOOP:
mov r1,#255
djnz r1,$
djnz r0,DELAY_OUTER_LOOP
pop 1
pop 0
ret
END
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