Thank Peter for your help, now I understood the dio, I work on the max 197...
Manu
--- In "PeterElliot" <> wrote:
>
> Hi Manu,
>
> Yes PBDR=0x30 would turn on both 4&5.
>
> I made a typo on the Hex Bit list. It should be:
>
> Bit 0: = 0x01 HEX
> Bit 1: = 0x02 HEX
> Bit 2: = 0x04 HEX
> Bit 3: = 0x08 HEX
> Bit 4: = 0x10 HEX
> Bit 5: = 0x20 HEX
> Bit 6: = 0x40 HEX <- Not 0x30
> Bit 7: = 0x80 HEX <- Not 0x40 Oops!
>
> PJE
>
> --- In "ejeffredo" <ejeffredo@> wrote:
> >
> > Dear Peter,
> >
> > thanks for your reply, that clear.
> > So if I want output 4 and 5 on, I write PBDR=0x30
> >
> > Manu
> >
> >
> >
> >
> > --- In "PeterElliot" <egroups@> wrote:
> > >
> > > --- In "ejeffredo" <ejeffredo@> wrote:
> > > >
> > > > Hi all,
> > > >
> > > > I need some explanation for dio register. For example :
> > > >
> > > > PBDDR = 0xf0 means dio 0 to 3 : input and dio 4 to 7 : output
> > > > PBDR = 0x01 : all dio =0 except dio 0 = 1
> > > >
> > > > Thanks,
> > > >
> > > > Manu
> > > >
> > >
> > >
> > > Hi Manu,
> > >
> > > You need to be a bit more specific about your question. Looking at what
> > > you wrote (and not referencing anything else).
> > >
> > > The digital I/O port (PB) above consists of two registers, the data
> > > direction register (PBDDR) which tells the port which of the eight bits
> > > are inputs (0) or outputs (1). The data is then read/written to the data
> > > register (PBDR), where reads from the register will read the inputs, and
> > > writes to the register set the state of the outputs.
> > >
> > > In your above example:
> > >
> > > Bit 0: = 0x01 HEX
> > > Bit 1: = 0x02 HEX
> > > Bit 2: = 0x04 HEX
> > > Bit 3: = 0x08 HEX
> > > Bit 4: = 0x10 HEX
> > > Bit 5: = 0x20 HEX
> > > Bit 6: = 0x30 HEX
> > > Bit 7: = 0x40 HEX
> > >
> > > Thus to set the data direction register for bits 4 to 7 to be outputs you
> > > add them up 0x10 + 0x20 + 0x40 + 0x80 = 0xF0.
> > >
> > > The PBDR=0x01 does not match with the PBDDR setting above as the PBDR
> > > instruction is trying to write an output to a pin set as an input. More
> > > likely would be PBDR=0x10 which would set output 4 on.
> > >
> > > Hope this makes things clearer.
> > >
> > > PJE
> > >
> >
>
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