That is what exactly is happening. It is writing 16 bit data!! Thanks a lot for pointing out the mistake. Please clarify how to write into the regisers properly. I tried searching, and with thatever ideas I got from google, I am not able to make it work. Please help.

I am using 8051F340 with 16 address lines and 8 data lines. Registers of wiznet are 8 bit registers. I need to write into /read from individual registers and also have to be able to increment decrement pointers and read/write continuously.

Please let me know how to do it.

At present I am doing it this way, which writes 16 bit data instead of 8 bit data. If I try
char xdata *wiznet, it isn't working.

#define SHAR5 0X200c
volatile uint16 xdata *wiznet;
wiznet= ((uint16 xdata *)SHAR5);

SIL_WRITE(wiznet,0x01);


void SIL_WRITE(uint16 *addr1,uint8 data1)
{
*addr1 = data1;
return;
}


How do I declare the pointer so that it just writes 8 bit address but to a 16 bit location? I have memory mapped the wiznet from 2000. I am also planning to add more memory (parallel). Your help would be appreciated.