The SAM-BA Boot is a monitor that provides In-System Programming solutions through different communication channels: DBGU serial port interface and the USB device port. In-System Programming (ISP) is the ability of some programmable logic devices, microcontrollers and other programmable electronic chips to be programmed while installed in a complete system, rather than requiring the chip to be programmed prior to installing it into the system. The SAM-BA offers several basic read/write commands (WORD, HALF WORD, BYTE) for direct access to the memory mapped and the peripheral registers. The SAM-BA monitor also checks, in an infinite loop, the two possible interfaces (USB/DBGU) until a communication is detected on one of them.