AN594 datasheet(23/28 Pages) STMICROELECTRONICS

23 / 28 page

Direct LCD Drive

23/28

set

1,LCDCTL

; end of loop2

reti

;*************************

PHASE 1

*********************************

LOOP1

call

DECCONV

; do hexa-decimal data conversion

call

DATALCD

; calculate phase1 segment driver byte

; driver data is stored in accumulator

ldi

pbbuf,00000011b

; pb buffer load

ldi

pb,00000011b

; b1 to 1

b0 in HI

ldi

pbdir,00110010b

; b2 — > b7 unchanged

ldi

pbopt,00110010b

;

pa,a

;load segment driver byte on port a

;

a,AUX3

;

x,a

;

a,AUX2

; return to main tasks with context

;

drwr,a

;(AUX2 <== drwr in main program)

;

a,AUX1

;

set

0,LCDCTL

; end of loop1

reti

;************************************************************************

END OF LCD DRIVER SUBROUTINE

;************************************************************************

DEC DATA/LCD SEGMEMTS CONVERSION SUBROUTINE

;* task : calculate the segments driver byte of the LCD

depends on the displayed data AND on the # of phase

based on DIG1 & DIG2 calculation

LCD segments driver full byte is in accumulator

;************************************************************************

DATALCD

ldi

drwr,3ch

; move data/rom window on DIGIT2 table

a,DIG2

x,a

a,(x)

y,a

; load DIGIT2 driver half byte (MSB)

ldi

drwr,3dh

; move data/rom window on DIGIT1 table

a,DIG1

x,a

a,(x)

and

a,y

; load DIGIT1 driver half byte (LSB)

ret

;************************************************************************

END OF DATA/LCD CONVERSION SUBROUTINE

;************************************************************************

ANNEX 2: Software of the ST6265x based application (Continued)

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