AT89c51snd1c

linnix wrote:
> aravind wrote:
> > linnix wrote:
> > > aravind wrote:
> > > > Does anyone know the hardware programming method of the mp3 player
> > > > chip, my bootloader is not working and i dont have access to a device
> > > > programmer
> > >
> > > The boot loader can only be reprogrammed with a parallel programmer,
> > > according to the spec.  We are in the process of building one for an
> > > avr, not sure if it is the same for 89C51.  We just need to implement a
> > > chip erase mode to bring back Jtag on the avr.
> >
> > I have already built a programmer for 89C51 chip. if i just know the
> > programming connections for AT89C51SND1C chip such as the address,data
> > and control pins i can easily program it.
>
> They are very similar, except that for the SND1C, P0 is multiplexed
> Address and Data.  All you need are A15:8, AD7:0, ALE, RD, WR and ISP.
> You should be able to modify your existing programmer for it.


                Do you have any idea of how to select the the different
functions such as to erase flash or program or read device id? I
currently have a 89C51 programmer where it can be programmed or erased
by changing the control signals on
P2.6, P2.7,P3.6, P3.7.How is the same done in SND1C chip.Can u please
tell me from where you have this information because none of the
datasheets or reference material at atmel's  website has any of this
data.Thank you