2018年01月11日 | 78e51_HT1621_LCD显示程序

2018-01-11 来源：eefocus

义隆78e51_HT1621_LCD显示程序

;**************************]
;MCU:W78E51(MCS-51 系列单片机 )
CS BIT P0.0
WRI BIT P0.2
DATA_BIT BIT P0.1

;30H~32H are used for write cycle flag

;40H~43H are used for delay sub-program

        ORG 0000H
START:
INIT:
CLR CS
MOV A,#10000000B ;select command writing
LCALL MODE_SELECT     ;sub_program for command mode or data mode selection
   MOV A,#01H ;system oscillator on
   LCALL WCOM
   MOV A,#03H ;display on
LCALL WCOM
MOV A,#29H ;set bias=1/3; duty=1/4
LCALL WCOM
SETB CS
MAIN:
lcall kenwood
lcall waitkey
LJMP START

clear:
setb cs ;these two rows are important
clr cs
MOV a,#0a0h
lcall mode_select
MOV a,#00h
lcall address
MOV r0,#017
clear1:
MOV a,#00h
lcall wdata
djnz r0,clear1
ret
kenwood:
setb cs
clr cs
MOV a,#0a0h
lcall mode_select
MOV a,#00h
lcall address
MOV a,#040h
lcall wdata
   kenwood_1:
setb cs
clr cs
MOV a,#0a0h
lcall mode_select
MOV a,#0
lcall address
MOV r1,#32
MOV dptr,#data_kenwood
   kenwood_2:
MOV a,#0
MOV c A,@a+dptr
lcall wdata
inc     dptr
djnz r1,kenwood_2
ret

MODE_SELECT:
MOV 33H,#03H
   MODE_SELECT1:
CLR WRI
RLC A
MOV DATA_BIT,C
LCALL DELAY_1MS
SETB WRI
DJNZ 33H,MODE_SELECT1
RET
WCOM:                            ;write command to ht1621
MOV 30H,#8
   WCOM2:

CLR WRI
RLC A
MOV DATA_BIT,C
LCALL DELAY_1MS
SETB WRI
DJNZ 30H,WCOM2

CLR WRI
; CLR DATA_BIT
LCALL DELAY_1MS
SETB WRI
RET

ADDRESS:   ;write address to ht1621
RLC A
RLC A
MOV 31H,#6
   ADD1:
CLR WRI
RLC A
MOV DATA_BIT,C
LCALL DELAY_1MS
SETB WRI
DJNZ 31H,ADD1
RET
WDATA:                           ;write data to ht1621
MOV 32H,#4
   WDATA1:
CLR WRI
RLC A
MOV DATA_BIT,C
LCALL DELAY_1MS
SETB WRI
DJNZ 32H,WDATA1
RET

WAITKEY:SETB      P2.0  ;wait a key to next screen
MOV    43H,#80
   WAITKEY1:
        LCALL     DELAY         ;IN ORDER TO ACCEPT SELECT STATUS
DJNZ   43H,WAITKEY1
    STATUS: MOV        C,P2.0
        JC        STATUS
        RET

WAIT:   MOV       42,#2FH
   WAIT0: LCALL    DELAY
        DJNZ     42,WAIT0
        RET

;DELAY SUBPROGRAM

DELAY: MOV      40H,#032H       ;10.05ms
   DELAY1: MOV      41H,#030H
   DELAY2: DJNZ    41H,DELAY2      ;192us
        DJNZ    40H,DELAY1
        RET
DELAY_1MS:
MOV 44H,#005H
   DELAY_1MS1:
MOV 45H,#030H
    DELAY_1MS2:
DJNZ 45H,DELAY_1MS2
DJNZ 44H,DELAY_1MS1
RET

data_kenwood:

db 070h,0f0h,0f0h,0f0h,0f0h,0f0h,
db      060h,000h
db      0f0h
db      050h,0b0h,0f0h,0f0h
db      000h,000h,000h,000h,0F0h ;seg9,seg10,seg11
db 0F0h,0F0h,0F0h,0F0h,0F0h,0F0h,0F0h,0F0h,0F0h,0F0h,0F0h,0F0h,0F0h,0F0h
END

78e51 HT1621 LCD显示

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