Datasheet

SAM3X / SAM3A [DATASHEET]
Atmel-11057C-ATARM-SAM3X-SAM3A-Datasheet_23-Mar-15
322
IAP software code example:
(unsigned int) (*IAP_Function)(unsigned long);
void main (void){
unsigned long FlashSectorNum = 200; //
unsigned long flash_cmd = 0;
unsigned long flash_status = 0;
unsigned long EFCIndex = 0; // 0:EEFC0, 1: EEFC1
/* Initialize the function pointer (retrieve function address from NMI vector)
*/
IAP_Function = ((unsigned long) (*)(unsigned long))
0x00800008;
/* Send your data to the sector here */
/* build the command to send to EEFC */
flash_cmd = (0x5A << 24) | (FlashSectorNum << 8) |
AT91C_MC_FCMD_EWP;
/* Call the IAP function with appropriate command */
flash_status = IAP_Function (EFCIndex, flash_cmd);
}
20.5 Hardware and Software Constraints
 SAM-BA Boot uses the first 2048 bytes of the SRAM for variables and stacks. The remaining available size
can be used for user's code.
 UART requirements:
 12.000 MHz quartz or 12.000 MHz external clock on XIN, or
 No quartz or external clock on XIN, or
 Below 5.0 MHz quartz or below 5.0 MHz external clock on XIN
 USB requirements:
 12.000 MHz quartz or 12.000 MHz external clock on XIN. 12 MHz must be ±500 ppm and 1.8V Square
Wave Signal.
Table 20-4. Pins Driven during Boot Program Execution
Peripheral Pin PIO Line
UART URXD PA8
UART UTXD PA9