microcontroller

1. ORG 0000H
LJMP MAIN
ORG 0030H
RS EQU P3.5
RW EQU P3.4
EN EQU P3.7
;initialization
MAIN: MOV A,#038H ;first time
LCALL COM
MOV A,#038H ;second time
LCALL COM
MOV A,#038H ;third time
LCALL COM
MOV A,#038H ;fourth time
LCALL COM
MOV A,#00CH
LCALL COM
MOV A,#001H
LCALL COM
MOV A,#006H
LCALL COM
MOV A,#083H
LCALL COM ;initialization End
;===========================================
MOV A,#'D' ;data to write on LCD
LCALL DATAW
LCALL DELAY
MOV A,#'A'
LCALL DATAW
LCALL DELAY
MOV A,#'R'
LCALL DATAW
LCALL DELAY
MOV A,#'E'
LCALL DATAW
LCALL DELAY
MOV A,#' '
LCALL DATAW
LCALL DELAY
MOV A,#'D'
LCALL DATAW
LCALL DELAY
MOV A,#'E'
LCALL DATAW
LCALL DELAY
MOV A,#'V'
LCALL DATAW
LCALL DELAY
MOV A,#'I'
LCALL DATAW
LCALL DELAY
MOV A,#'L'
LCALL DATAW
LCALL DELAY
;===========================================
MOV A,#0C1H
LCALL COM
;===========================================
MOV A,#'A' ;data to write on LCD
LCALL DATAW

2. LCALL DELAY
MOV A,#'S'
LCALL DATAW
LCALL DELAY
MOV A,#'I'
LCALL DATAW
LCALL DELAY
MOV A,#'F'
LCALL DATAW
LCALL DELAY
MOV A,#' '
LCALL DATAW
LCALL DELAY
MOV A,#'A'
LCALL DATAW
LCALL DELAY
MOV A,#'L'
LCALL DATAW
LCALL DELAY
MOV A,#'I'
LCALL DATAW
LCALL DELAY
MOV A,#' '
LCALL DATAW
LCALL DELAY
;===========================================
MOV A,#'R' ;data to write on LCD
LCALL DATAW
LCALL DELAY
MOV A,#'A'
LCALL DATAW
LCALL DELAY
MOV A,#'J'
LCALL DATAW
LCALL DELAY
MOV A,#'P'
LCALL DATAW
LCALL DELAY
MOV A,#'U'
LCALL DATAW
LCALL DELAY
MOV A,#'T'
LCALL DATAW
LCALL DELAY
;===========================================
AGAIN: SJMP AGAIN ;endless loop
COM: MOV P1,A ;command write sequence
CLR RS
CLR RW
SETB EN
;LCALL TEST
CLR EN
LCALL DELAY
RET
DATAW: MOV P1,A ;data write sequence
SETB RS
CLR RW
SETB EN
;LCALL TEST
CLR EN

3. LCALL DELAY
RET
DELAY: MOV R6,#50 ;simple delay routine
HERE2: MOV R7,#255 ;for 0.0124S or 124MS
HERE: DJNZ R7,HERE
DJNZ R6,HERE2
RET
TEST: JB P3.0,TEST
TEST2: JNB P3.0,TEST2
RET
END