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Datenblatt-Suchmaschine für elektronische Bauteile |
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Datenblatt-Suchmaschine für elektronische Bauteile |
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AN594 Datenblatt(PDF) 13 Page - STMicroelectronics |
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AN594 Datenblatt(HTML) 13 Page - STMicroelectronics |
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13 / 28 page  Direct LCD Drive 13/28 BOUCLE2 LDI TCR,18 ; timer initialization LDI TSCR,7Fh ; program it at 1.5 ms INC TABU ; determine data/rom window address INC TABD ; of tables 1 & 2 for phase 2 CALL DATALCD ; determine segments driver byte for PHASE 2 LDI ORA,07h ; BP1 = Vdd/2 ; BP2 = Vss therefore LDI DRA,40h LDI DDRA,87h ; A6 becomes high impedance input LDI ORA,87h ; & A7 becomes push pull output at Vss LD DRB,A ; load segments driver byte on port WAIT ;************************************************************************** BOUCLE3 LDI TCR,18 ; timer initialization LDI TSCR,7Fh ; program it at 1.5 ms INC TABU ; determine data/rom window address INC TABD ; of tables 1 & 2 for phase 2 CALL DATALCD ; determine segments driver byte for PHASE 3 LDI DRA,0C0h ; BP1 = Vdd/2 ; BP2 = Vdd therefore ; A6 remains high impedance input ; A7 becomes push pull output at Vdd LD DRB,A ; load segments driver byte on port WAIT ;************************************************************************** BOUCLE4 LDI TCR,18 ; timer initialization LDI TSCR,7Fh ; program it at 1.5 ms INC TABU ; determine data/rom window address INC TABD ; of tables 1 & 2 for phase 2 CALL DATALCD ; determine segments driver byte for PHASE 4 LDI ORA,07h ; BP1 = Vss ; BP2 =A Vdd/2 therefore LDI DRA,80h LDI DDRA,47h ; A6 becomes output at Vss LDI ORA,47h ; A7 becomes high impedance input LD DRB,A ; load segments driver byte on port WAIT ;************************************************************************** FINBOUCLE JRR 0,FLAGS,BOUCLE1 ;IF ON/OFF button remains pushed, ; THEN circuit is in stand by & display is ; ELSE continue digits display LDI DRA,00h LDI DDRA,0C7h LDI ORA,0C7h ; BP1 & BP2 on output to Vss LDI DRB,00h PREPSOMM CALL CLAVIER ; test of keyboard LD A,TOUCH CPI A,0Ah ; wait falling edge of ON/OFF button JRZ PREPSOMM ; before stop display mode JP SOMMEIL ;************************************************************************** ;* END OF MAIN PROGRAM ;************************************************************************** ANNEX 1: Software of the ST6215x based application (Continued) |
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