Hi,
If you are using Keil for the microcontroller programming, you can use MOVX instruction to write in the external memory.
Check it out. It may help u.
Thanks..
HAK..
Added after 3 minutes:
Hi,
this is the command description:
Operation: MOVX
Function: Move Data To/From External Memory (XRAM)
Syntax: MOVX operand1,operand2
Instructions OpCode Bytes Cycles Flags
MOVX @DPTR,A 0xF0 1 2 None
MOVX @R0,A 0xF2 1 2 None
MOVX @R1,A 0xF3 1 2 None
MOVX A,@DPTR 0xE0 1 2 None
MOVX A,@R0 0xE2 1 2 None
MOVX A,@R1 0xE3 1 2 None
Description: MOVX moves a byte to or from External Memory into or from the Accumulator.
If operand1 is @DPTR, the Accumulator is moved to the 16-bit External Memory address indicated by DPTR. This instruction uses both P0 (port 0) and P2 (port 2) to output the 16-bit address and data. If operand2 is DPTR then the byte is moved from External Memory into the Accumulator.
If operand1 is @R0 or @R1, the Accumulator is moved to the 8-bit External Memory address indicated by the specified Register. This instruction uses only P0 (port 0) to output the 8-bit address and data. P2 (port 2) is not affected. If operand2 is @R0 or @R1 then the byte is moved from External Memory into the Accumulator.
Thanks..
HAK..