Ver1.1

13

LD3003

128 Segment LCD Controller and Driver

APPLICATION INFORMATION

PORTC

EQU

$02

PORTC

DDRC

EQU

$06

PORTDC

SEN

EQU

$07

ENABLE PIN, PC7

SCL

EQU

$06

CLOCK PIN, PC6

SDA

EQU

$05

DATA PIN, PC5

DOUT

EQU

$FF

OUTPUT DATA

ORG

$0050

W1

RMB

1

COUNT

RMB

1

ORG

$1FFE

ADDRESS OF RESET VECTOR OF MC68HC05C4

FCB

#$01

RESET VECTOR

FCB

#$00

********************* Main Program start at 0100 **********************

ORG

$0100

START

LDA

#DOUT

SET DATA LINE OUTPUT

STA

DDRC

AGAIN

LDX

#$00

BSET

SDA, PORTC

IDLE STATE

BSET

SCL, PORTC

CLOCK AND DATA ARE HIGH

READY

BSET

SEN, PORTC

EN=1

LDA

#$11

SET ADDRESS AND 8 CHARACTERS

STA

W1

BCLR

SDA, PORTC

START CONDITION, DATA LOW WHILE CLOCK HIGH

LBYTE

CLC

LDA

#$08

STA

COUNT

8 BITS TO SHIFT

LDA

SEND, X

GET A BYTE

INCX

DOUT

SCK

STB

MC68HC05

DIN

OSC1

DCLK

ENB

OSC2

COM1 ~ COM4

SEG1 ~ SG32

LD3003

R=470K

Ω

Serial Interface Example between LD3003 and MC68HC05

SERIAL DATA INTERFACE METHOD