How to write data in Flash data memory?

Dear Sir,

I had read the datasheet and according to that only i wrote one simple program to store the bytes in one page.Here I am sending the function statements to write the bytes in data memory.

void Flash_Mem_Write_Page(void)
{ EADRH=0x00; //Select Address hoiher byte
EADRL=0x01; //Select addres lower byte

EDATA1=0x12; //writing the data
EDATA2=0x13;
EDATA3=0x14;
EDATA4=0x15;

ECON=0x02; //writing the bytes
Sleep(40);
ECON=0x04; //verifying
Sleep(22);

if(!ECON) //match is there it will return 0in ECON
printf("WRITE\n");
else
printf("NOT WRITE\n");
}

Thank you very much for replying.

Dear Sir,

I had read the datasheet and according to that only i wrote one simple program to store the bytes in one page.Here I am sending the function statements to write the bytes in data memory.

void Flash_Mem_Write_Page(void)
{ EADRH=0x00; //Select Address hoiher byte
EADRL=0x01; //Select addres lower byte

EDATA1=0x12; //writing the data
EDATA2=0x13;
EDATA3=0x14;
EDATA4=0x15;

ECON=0x02; //writing the bytes
Sleep(40);
ECON=0x04; //verifying
Sleep(22);

if(!ECON) //match is there it will return 0in ECON
printf("WRITE\n");
else
printf("NOT WRITE\n");
}

Thank you very much for replying.

"I had read the datasheet"

I hope you read it more carefully than the instructions here for posting source code:

www.danlhenry.com/.../keil_code.png

You also, apparently, didn't notice the problem in the 'Preview' - I hope you've reviewed your own code more carefully?

First, you said, "I wrote the routines as mentioned in application note"

Now you say, "I had read the datasheet and according to that only i wrote one simple program" (my emphasis)

So which is it - datasheet or application note?

or both?

or what?

Look at followed example. It works on ADuC847.

// ****************************************************
// save 4 bytes to addr 0x3FF
// ****************************************************
void SaveSetPointToFlash(unsigned char* puc)
{
 EA = 0;          // Disable interrupts before saving
 EADRH = 0x03;    // High byte of page Address
 EADRL = 0xFF;     // Low byte of page Address
 EDATA1 = puc[0]; // Data to flash
 EDATA2 = puc[1]; // Data to flash
 EDATA3 = puc[2]; // Data to flash
 EDATA4 = puc[3]; // Data to flash
 ECON = 0x05;     // Erase Page
 ECON = 0x02;     // Write Page
 ECON = 0x04;     // Verify Page
 EA = 1;          // enable interrupts after saving
}

As notes Christoph you should provide erasing page and remove delays.