C51: Interfacing Flash AT29C512 with AT89C51

sir, am trying my first hand at these things,
In the data sheet, the address is sent as 32 bit,
so for device id it is written as 0x00000,
so also in the timing diagram

probably you could patiently explain as you seem an expert to novices

Thanks,

sir, am trying my first hand at these things,
In the data sheet, the address is sent as 32 bit,
so for device id it is written as 0x00000,
so also in the timing diagram

probably you could patiently explain as you seem an expert to novices

Thanks,

the AT29C512 is 16 bit address

I'd suggest you leave the SST25VF512 alone. As opposed to many serial memories, it requires separate page/chip erase, not just write. Have a look at the offereings that just require a write from e.g. Ramtron.

Of course, since you have not stated what you want to store on the serial flash, I may be off here.

Erik

"am trying my first hand at these things"

What you really need to learn is how to find the necessary materials for yourself.

It goes something like this:

Go to the SST website, and type "SST25VF512" into the search box in the top-right corner.

That will take you to a page all about the SST25VF512;
Down the left-hand side, you will see a box headed "Product Resources"
In that box, you will see links for 'Application Notes' etc.

You should explore these links - you may well find that your questions are answered there!

thanks a lot,

got the receive data part right , not bad, for a start i suppose
the sample surely helped in sending data
though not able to find why the data is not being sent on the hyperterminal

P1 = byte;
ACC = byte;
SBUF = ACC;

any thing to be added to this?

thanks a lot,

got the receive data part right , not bad, for a start i suppose
the sample surely helped in sending data
though not able to find why the data is not being sent on the hyperterminal

P1 = byte;
ACC = byte;
SBUF = ACC;

any thing to be added to this?

though not able to find why the data is not being sent on the hyperterminal

where/what is the UART initialize code?

TMOD = 0x20;
TH1 = -3;
SCON = 0x50;
TR1 =1;
TI = 0;

using sector erase to see if few bytes of data can be written and read back properly,
On serial flash , a program with a large memory requirement will be stored,
thats why we are interfacing the serial flash

thanks,

the initialize code is in Main() program
with 4800 or 9600 baud

sir,
have tried at this
just not getting data on hyperterminal
though it is being transmitted from 8051,
displeyed thru port-1 also,

this is the code which i used:

#include<reg51.h>
#include<stdio.h>

Rx();
Tx();

void main (void){
        TMOD = 0x20;
        TH1 = -3;               // 9600 baud, SMOD = 0;
        SCON = 0x50;    // 8 bit, 1 stop, REN-1
        TR1 = 1;
        TI = 0;
        Rx();
}

Rx(){
        while (1){              //(RI=1){
                ACC = 0000;
                ACC = SBUF;
                P1 = ACC;
                Tx();
                RI = 0;
                Rx();
        }
}

Tx(){
        // ACC = (ACC + 48);
        SBUF = ACC;
        while(TI){
                TI = 0;
        }
}

On serial flash , a program with a large memory requirement

You can't execute code from serisal flash.

How do you propose to make this work?

Erik

just not getting data on hyperterminal

which transciever (e.g. MAX232) do you use and what is the supply voltage for it?

Erik

You should not be writing direct to ACC in 'C'!!

Your Rx() function calls itself in an infinite loop!

Throw this code away, and start with the "Hello World" sample.
Then build on that...

Ya using MAX232
Actually, the terminal works fine with assembly program
In the above program, Rx() also works.
There is some problem with this 'Tx()' function
could somebody Please help me out what is that fine change to be done

Sorry, Rx() was not being called recursively, that line was supposed to be commented
Sorry for that
To call recursively, I believe it should be declared as "reentrant"

Why should we write to ACC directly in 'C'?
then how do we write to ACC?

Why should we notwrite to ACC directly in 'C'?
because you do not need to
then how do we write to ACC?
you do not need to and, if you do, you are virtually guaranteed to make the code fail.

  ACC = (ACC + 48);
  SBUF = ACC;

should be
U8 Ralph;
....

  Ralph += 48;
  SBUF = Ralph

Erik