hi, i was trying 2 interface SST flash 39vf400a external flash located at 0x000000. however, while debugging i'm using a initialization file wherein i point PC to internal 8k SRAM address(0x10000000) it works fine.So i'm able to run programs where flash memory is not needed. But if want to erase sector of flash & try to "step through" the code which the SST flash site has provided i am not able to do so.if anybody could help me i would be very much greatful. Thanks & regards Renuka Prasad
i have only one external flash interfaced at location 0x0000000. but i do have internal 8k sram at address 0x10000000 & i am using this location to download code. this method is working fine as long as i dont touch the flash memory locations. Temp1 = (unsigned long *)0x00005555; *Temp1= 0xAAAA; 1. line points to flash location 2. write data 0xAAAA to the address. when then pc comes to the 2 line it invokes Data abort interrupt.
"when then pc comes to the 2 line it invokes Data abort interrupt." Of course it does. Your access is misaligned. Look at your flash datasheet, your schematic, and where the address lines are connected. Adjust your address accordingly. http://www.keil.com/forum/docs/thread6013.asp