AN1447 datasheet(21/26 Pages) STMICROELECTRONICS

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4-MULTIPLEXED LCD WITH A STANDARD ST62

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

LCD_Do:

; Updates the LCD outputs (commons & segments) to

; display the requested digits.

; Prereq.

: ’LCD_Init’ called before

; Inputs

: ’min_dig0’, ’min_dig1’, ’hr_dig0’, ’hr_dig1’

;

+ ’icons’

; Outputs

: ’DDR_com’, ’DR_com’, ’DR_com_2’, ’OR_com’,

;

’DR_seg’ and ’DR_seg_2’ refreshed

; IMPORTANT: once the LCD I/Os are initialised, this

; subroutine must be called frequently to prevent

; damaging the LCD.

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

;--- Depending on flash strobe, update segment images ---

a,min_dig0

jrr

0,strobe,min0

jrr

MIN0,flashing,min0

ldi

a,BLANK

min0:

mindig0I,a

a,min_dig1

jrr

0,strobe,min1

jrr

MIN1,flashing,min1

ldi

a,BLANK

min1:

mindig1I,a

a,hr_dig0

jrr

0,strobe,hr0

jrr

HR0,flashing,hr0

ldi

a,BLANK

hr0:

hrdig0I,a

a,hr_dig1

jrr

0,strobe,hr1

jrr

HR1,flashing,hr1

ldi

a,BLANK

hr1:

hrdig1I,a

clr

jrr

0,strobe,iconsegs

a,flashing

iconsegs:

com

and

a,icons

iconsI,a

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