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Os motores de busca de Datasheet de Componentes eletrônicos |
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Os motores de busca de Datasheet de Componentes eletrônicos |
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AY0438IP Folha de dados(PDF) 6 Page - Microchip Technology |
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AY0438IP Folha de dados(HTML) 6 Page - Microchip Technology |
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6 / 11 page  AY0438 DS70010I-page 6 © 1995 Microchip Technology Inc. retlw B'01111101' ;decode for 6 retlw B'00000111' ;decode for 7 retlw B'01111111' ;decode for 8 retlw B'01101111' ;decode for 9 ; ; start clrf PORTB bsf STATUS,RP0 ;set portb 0,1&2 as outputs movlw B'11111000' ; / movwf PORTB ; / bcf OPTION,RBPU ;enable pull-up for switch bcf STATUS,RP0 wait btfsc UPDATELCD ;see if update switch is low goto wait ;no then wait bcf LOAD ;make sure load is disabled movf LSD,w ;get least significant value clrf PCLATH ;PCH = 0 call DecodeValue ;decode the value call Send8 ;serially output the seg values movf SCNDSD,w ;get 2nd significant digit call DecodeValue ;decode it call Send8 ;serially output it movf THRDSD,w ;get 3rd significant digit call DecodeValue ;decode it call Send8 movf MSD,w ;get Most significant value call DecodeValue ;decode it call Send8 ;serially send it bsf LOAD ;toggle the LOAD line bcf LOAD ;to enable the latches KeyReleased btfss UPDATELCD ;wait for key to be released goto KeyReleased goto wait ;repeat loop. ; ;Send8, sends the 8 bits in the W register Send8 movwf temp ;save in temp movlw .8 ;init count movwf count ;to 8 sendloop bcf DATAIN ;make sure DATAIN is low rrf temp ;rotate value through carry btfsc STATUS,C ;if bit clear then skip bsf DATAIN ;else set data bit bsf CLK ;toggle clock bcf CLK ; / decfsz count ;see if 8 done goto sendloop ;no then do all return ;else return end |
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