AN1447 datasheet(16/26 Pages) STMICROELECTRONICS

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4-MULTIPLEXED LCD WITH A STANDARD ST62

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

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

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

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

EXTERN CODE (LCD_Init)

; Initialises the ressources used by the library.

; Prereq.

: none

; Inputs

: none

; Outputs

: internal variables initialised,

;

segment pins configured as output push-pull

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

EXTERN CODE (LCD_Flash)

; Switches the flash strobe if necessary

; Prereq.

: none

; Inputs

: flashing

; Outputs

: none

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

EXTERN CODE (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.

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

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