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Tom=E1s =D3 h=C9ilidhe wrote:
> Wouter van Ooijen wrote:
>  =20
>> Depending on the currents, I might have selected a HC595 for the low=20
>> side driver, saving some PIC pins.
>>  =20
>>    =20
>
> Somebody mentioned this chip to me already. I looked it up and go its=20
> datasheet but I couldn't make any sense of it. Haven't a clue what it d=
oes.
>
>  =20
Here a small sample.
You can also chain more device.
Have fun
      Nicola


> ;TRISB =3D output for these 3 pin
> #define out_latch595    PORTB,1   ;pin 12 of HC595
> #define out_data595     PORTB,2   ;pin   9 of HC595
> #define out_sck595       PORTB,3   ;pin 11 of HC595
>
>
>            UDATA
> X         RES  1
> Y         RES  1
>
>       ...
>       movlw       b'01010101'    ;lsb =3D pin QA
>       call            Write595
>       ...
>
>
> Write595
>         movwf   Y               ;save data to send
>
>         movlw   .8
>         movwf   X               ;bit counter
>
>         bcf     out_latch595
>         bcf     out_sck595
>        =20
> lp595
>         bcf     out_data595
>         rlf     Y,f                      ;next bit goes to carry
>         btfsc   STATUS,C
>         bsf     out_data595
>
>         nop                            ;some device require a small=20
> pause not all
>
>         bsf     out_sck595      ;low to high transition causes bit=20
> data shifted
>         bcf     out_sck595
>
>         decfsz  X,f
>         goto    lp595
>
>         bsf     out_latch595      ;Latch: transfer data to output pin
>         return


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