PIC16F877A LCD驱动HT1621的源代码

STATUSEQU3H
FSREQU4H
RBEQU6H
RCEQU7H
OPTIONAEQU81H
TRISBEQU86H
TRISCEQU87H

GENR0EQU053H
GENR1EQU054H
WD_RGEQU055H
DA_AG0EQU056H;SEG0SEG1
DA_AG8EQU05EH;SEG16SEG17
;.............................
CEQU0
ZEQU2
RP0EQU5
RP1EQU6
CSEQU2
WDAEQU5;RC,5数据线
WCLKEQU1;RB,1写时钟线
RCLKEQU4;RB,4读时钟线
;..............................
ORG0H
GOTOSTART
;...............................
STARTBSFSTATUS,RP0
MOVLW00H
MOVWFTRISB
MOVLW81H
MOVWFTRISC
BCFSTATUS,RP0
MOVLW12H
MOVWFRB
BSFRC,2
BSFRC,5
MOVLW4
MOVWFOPTIONA
LOOPNOP
CALLX_QUAN
NOP
GOTOLOOP

;............................
X_QUAN
MOVLW8H
CALLON_LCD;TRANSMITTH1621WORKMODEVALUE

MOVLW9H;显示9位LCD
CALLDIS_DATA

RETURN
;............................
ON_LCDMOVWFGENR1
BCFRC,2
MOVLW80H;HI_W3BITS:100
MOVWFWD_RG
MOVLW3;3位命令100
CALLTRAM_DATA
ON_LCD0MOVFGENR1,0
CALLON_VALUE;查表初始化LCD
MOVWFWD_RG

MOVLW8;送8位查表值
CALLTRAM_DATA

BCFRC,WDA
NOP
NOP
BCFRB,1
NOP
NOP
BSFRB,1
BSFRC,2
DECFSZGENR1,1
GOTOON_LCD+1
RETURN
;........................
ON_VALUE
ADDWF2
NOP
RETLW03H;LCDON
RETLW01H;SYSON

RETLW08H;TONEOFF
RETLW29H;BISA1/34COM
RETLW18H;256K
RETLW05H;WDTDISABLE

RETLW80H;/IRQDISABLE*
RETLW0E3H;NORMALMODE*

;................................
;TRANSMITBITSSUBROUTINE
TRAM_DATA
BCFSTATUS,0
MOVWFGENR0
BCFRB,1
RLFWD_RG
BTFSS3,0
GOTO$+3
BSFRC,WDA
GOTO$+2
BCFRC,WDA

BSFRB,1
DECFSZGENR0,1
GOTOTRAM_DATA+2

RETURN
;.......................
DIS_DATA
MOVWFGENR1;9位LCD
BCFRC,2
MOVLW0A0H
MOVWFWD_RG;WRITECONTROL

MOVLW3H;3位写命令101
CALLTRAM_DATA
MOVLW00
MOVWFWD_RG;WRITEADDRESS
MOVLW6H;6位地址
CALLTRAM_DATA;
DIS_DATA0

MOVLW0FFH
MOVWFWD_RG;DISPLAYCODE

MOVLW8;8段数据
CALLTRAM_DATA

DECFSZGENR1,1
GOTODIS_DATA0
BSFRC,2
RETLW0
END