Hi all.

I read the at29c512 datasheet, but I can write more than 256 bytes into this memory.

void write_sector()
{
_asm
mov dptr, #0xD555
mov a, #0xAA
movx @dptr, a
mov dptr, #0xAAAA
mov a, #0x55
movx @dptr, a
mov dptr, #0xD555
mov a, #0xA0
movx @dptr, a
;The address is 0x8100

mov a,#0x81
mov r3, a
clr a
mov r2, a
;The total of bytes is 256
mov r0, #0x00

mov dpl, r2
mov dph, r3
ipro: mov a, 0x55
movx @dptr,a
inc dptr
djnz r0, ipro
_endasm;
delayms(twc);
}
I tried to write 512 bytes but only 256 apear with a value I tried to write.

What am I doing wrong?

thank you