На сколько я понимаю, там bootloader зашит в каждый кристалл.
Цитата
The SAM-BA™ Boot Recovery restores the SAM-BA Boot in the first two sectors of the on-chip Flash memory. The SAM-BA Boot recovery is performed when the TST pin and the PA0, PA1 and PA2 pins are all tied high.
The SAM-BA Boot Assistant is a default Boot Program that provides an easy way to program
in situ the on-chip Flash memory.
The SAM-BA Boot Assistant supports serial communication through the DBGU or through the
USB Device Port. (The AT91SAM7S32 has no USB Device Port.)
• Communication through the DBGU supports a wide range of crystals from 3 to 20 MHz via
software auto-detection.
• Communication through the USB Device Port is limited to an 18.432 MHz crystal.
The SAM-BA Boot provides an interface with SAM-BA Graphic User Interface (GUI).
Сообщение отредактировал vovanse - Apr 21 2009, 08:04