PIC16F877A LCD driver HT1621 source code
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 data lines
WCLKEQU1; RB, 1 write clock line
RCLKEQU4; RB, 4 read clock line
;..............................
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; display 9-bit LCD
CALLDIS_DATA
RETURN
;............................
ON_LCDMOVWFGENR1
BCFRC, 2
MOVLW80H; HI_W3BITS: 100
MOVWFWD_RG
MOVLW3; 3-bit command 100
CALLTRAM_DATA
ON_LCD0MOVFGENR1,0
CALLON_VALUE; lookup table initializes LCD
MOVWFWD_RG
MOVLW8; send 8 bit table value
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-digit LCD
BCFRC, 2
MOVLW0A0H
MOVWFWD_RG;WRITECONTROL
MOVLW3H; 3-bit write command 101
CALLTRAM_DATA
MOVLW00
MOVWFWD_RG;WRITEADDRESS
MOVLW6H; 6-bit address
CALLTRAM_DATA;
DIS_DATA0
MOVLW0FFH
MOVWFWD_RG;DISPLAYCODE
MOVLW8; 8 segments of data
CALLTRAM_DATA
DECFSZGENR1,1
GOTODIS_DATA0
BSFRC, 2
RETLW0
END
This is a sample source code for the HT1621 LCD driver using the PIC16F877A microcontroller. It includes register definitions, configuration settings, and subroutines to control the LCD display. The code initializes the microcontroller, configures I/O ports, and sends commands and data to the HT1621 chip. It also includes routines for transmitting bits, sending data to the LCD, and managing the display content. This code is useful for embedded systems projects that require an LCD interface.
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