AN1447 datasheet(20/26 Pages) STMICROELECTRONICS

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4-MULTIPLEXED LCD WITH A STANDARD ST62

;*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*

; *-*-*-*-*-*-*-* Subroutines *-*-*-*-*-*-*-*-*

;*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*

PUBLIC LCD_Init, LCD_Flash, LCD_Do

LCD_subs

SEGMENT CODE

RSEG LCD_subs

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

LCD_Init:

; Initialises the ressources used by the library.

; Prereq.

: display variables must have been initialised

;

by the main routine

; Inputs

: none

; Outputs

: internal variables initialised,

;

segment pins configured as output push-pull

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

clr

LCD_Ph

clr

strobe

ldi

a,SEG_SEL

add

a,DDR_seg

DDR_seg,a

ldi

a,SEG_SEL

add

a,OR_seg

OR_seg,a

; Output internal to the driver:

;

’LCD_Ph’ and ’strobe’ initialised’

ret

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

LCD_Flash:

; Switches the flash strobe if necessary

; Prereq.

: none

; Inputs

: ’flashing’

; Outputs

: none

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

a,strobe

jrnz

strobe1

strobe0:

a,flashing

jrz

exit_sub

ldi

strobe,0ffh

exit_sub:

ret

strobe1:

clr

strobe

ret

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