The JTAG interface can access all the internal resources of the MSP430 microcontroller. Through JTAG, the chip can be downloaded, the code can be debugged, the memory can be modified, etc. Through JTAG, the encryption fuse can also be burned. Once the fuse is burned, most of the functions of the JTAG interface will fail, and programming can no longer be performed through it. The BSL interface is a self-programming interface that uses the bootloader program resident inside the chip. Through a specific timing, the CPU enters the bootloader code break, and then uses the Timer A inside each MSP430 chip to form a software serial port to communicate with the host computer, so that the code can be downloaded to the chip. In addition to some pins of the JTAG interface, two TA0 function pins are also required to implement BSL. Therefore, if encryption is required when designing a product, these two pins should also be considered to be connected.
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