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AN1447 Datasheet(PDF) 24 Page - STMicroelectronics |
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AN1447 Datasheet(HTML) 24 Page - STMicroelectronics |
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24 / 26 page  24/26 4-MULTIPLEXED LCD WITH A STANDARD ST62 add a,LCD_Ph ld x,a ld a,OR_com andi a,COM_MASK add a,(x) ld OR_com2,a ;--- Perform the changes on the real ports --- ; Segments port ld a,DR_seg_2 ld DR_seg,a ; Commons port ld a,OR_com andi a,COM_MASK ld OR_com,a ld a,DDR_com2 ld DDR_com,a ld a,DR_com_2 ld DR_com,a ld a,OR_com2 ld OR_com,a ;--- Increment phase counter --- inc LCD_Ph ld a,LCD_Ph andi a,07h ld LCD_Ph,a ; LCD_Ph = (LCD_Ph + 1) mod 8 ; Output internal to the driver: ; ’LCD_Ph’ updated ret ;***************************************************************** find_seg: ; Finds the segment outputs for a given digit, a given ; character and a given LCD phase. ; Prereq. : none ; Inputs : ’LCD_Ph’, V = LCD_Ph mod 4, ; a = code of the character (0 to 15), ; W = segment I/O port mask for the digit ; Outputs : ’DR_seg_2’ refreshed ; Modifies : X ;***************************************************************** |
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