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1.
Program to display "ELECTROFRIENDS" in LCD without checking busy
flag.
MOV A,#38H
; initialization LCD 2lines, 5x7 matrix.
ACALL COMMAND
; call command subroutine.
ACALL DELAY
; call delay subroutine.
MOV A,#0EH
; display on, cursor on
ACALL COMMAND
ACALL DELAY
MOV A,#01H
; Clear LCD
ACALL COMMAND
ACALL DELAY
MOV A,#06H
; shift cursor right
ACALL COMMAND
ACALL DELAY
MOV A,#80H
; cursor at beginning of 1st line
ACALL COMMAND
ACALL DELAY
MOV A,#'E'
; display letter E
ACALL DATA
ACALL DELAY
MOV A,#'L'
; display letter L
ACALL DATA
ACALL DELAY
MOV A,#'E'
; display letter E
ACALL DATA
ACALL DELAY
MOV A,#'C'
; display letter C
ACALL DATA
ACALL DELAY
MOV A,#'T'
; display letter T
ACALL DATA
ACALL DELAY
MOV A,#'R'
; display letter R
ACALL DATA
ACALL DELAY
MOV A,#'O'
; display letter O
ACALL DATA
ACALL DELAY
MOV A,#'F'
; display letter F
ACALL DATA
ACALL DELAY
MOV A,#'R'
; display letter R
ACALL DATA
ACALL DELAY
MOV A,#'I'
; display letter I
ACALL DATA
ACALL DELAY
MOV A,#'E'
; display letter E
ACALL DATA
ACALL DELAY
MOV A,#'N'
; display letter N
ACALL DATA
ACALL DELAY
MOV A,#'D'
; display letter D
ACALL DATA
ACALL DELAY
MOV A,#'S'
; display letter S
ACALL DATA
ACALL DELAY
HERE: JMP HERE
COMMAND: MOV P1,A
; Send command to LCD
CLR P3.4
; RS=0 for command
CLR P3.5
; R/W=0 for write
SETB P3.3 ; E=1 for
high pulse
CLR P3.3
; E=0 for H-to-L pulse
RET
DATA:
MOV P1,A ; Write
data to LCD
SETB P3.4 ; RS=1 for
data
CLR P3.5
; R/W=0 for write
SETB P3.3 ; E=1 for
high pulse
CLR P3.3
; E=0 for H-to-L pulse
RET
DELAY:
MOV R2,#50
D1:
MOV R3,#0FFH
D2:
DJNZ R3,D2
DJNZ R2,D1
RET
2. Program to display "ELECTROFRIENDS" in LCD with checking busy
flag.
MOV A,#38H
; initialization LCD 2lines, 5x7 matrix.
ACALL COMMAND
; call command subroutine.
MOV A,#0EH
; display on, cursor on
ACALL COMMAND
MOV A,#01H
; Clear LCD
ACALL COMMAND
MOV A,#06H
; shift cursor right
ACALL COMMAND
MOV A,#80H
; cursor at beginning of 1st line
ACALL COMMAND
MOV A,#'E'
; display letter E
ACALL DATA
MOV A,#'L'
; display letter L
ACALL DATA
MOV A,#'E'
; display letter E
ACALL DATA
MOV A,#'C'
; display letter C
ACALL DATA
MOV A,#'T'
; display letter T
ACALL DATA
MOV A,#'R'
; display letter R
ACALL DATA
MOV A,#'O'
; display letter O
ACALL DATA
MOV A,#'F'
; display letter F
ACALL DATA
MOV A,#'R'
; display letter R
ACALL DATA
MOV A,#'I'
; display letter I
ACALL DATA
MOV A,#'E'
; display letter E
ACALL DATA
MOV A,#'N'
; display letter N
ACALL DATA
MOV A,#'D'
; display letter D
ACALL DATA
MOV A,#'S'
; display letter S
ACALL DATA
HERE: JMP HERE
COMMAND: CALL READY ; check whether LCD is
ready
MOV P1,A ; Send
command to LCD
CLR P3.4
; RS=0 for command
CLR P3.5
; R/W=0 for write
SETB P3.3 ; E=1 for
high pulse
CLR P3.3
; E=0 for H-to-L pulse
RET
DATA:
CALL READY ; check whether LCD is ready
MOV P1,A ; Write
data to LCD
SETB P3.4 ; RS=1 for
data
CLR P3.5
; R/W=0 for write
SETB P3.3 ; E=1 for
high pulse
CLR P3.3
; E=0 for H-to-L pulse
RET
READY:
SETB P1.7 ; make
P1.7 input port
CLR P3.4
; RS=0
SETB P3.5 ; R/W=0
for read
UP:
SETB P3.3 ; E=1 for
high pulse
CLR P3.3
; E=0 for H-to-L pulse
JB P1.7, UP ; stay until LCD is
busy
RET
For queries on the above please
contact
ranjith@electrofriends.com
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Previous page |
by
Ranjith Yadapadithaya
ranjith@electrofriends.com
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