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Hi This is code compiled with Keil C, but not working #include <AT89X51.H> xdata char Index _at_ 0x00; void Clear_DDRAM(char index); void main(void) { Clear_DDRAM(0x00); while(1); } void Clear_DDRAM(char index) { int a; for(a=0;a<65536;a++) { P3_4=0; //IOCS=0; P3_1=0; P3_0=0; P1_0=0; //Reset=0; Index=index; P3_4=1; //IOCS=1; Index=Index+a; } } The xdata has 64K address range. Here is my queation: How to series to write data(0x00) into next address(Star address at 0x00). The assembly code is "INC DPTR" so have any instruction like it in keil C.
Dear Jay Thanks for your suggest code that I've tried and modify for my application. It is OK.