SLAA649G October 2014 – August 2021 MSP430F2001 , MSP430F2002 , MSP430F2003 , MSP430F2011 , MSP430F2012 , MSP430F2013 , MSP430F2013-EP , MSP430F2101 , MSP430F2111 , MSP430F2112 , MSP430F2121 , MSP430F2122 , MSP430F2131 , MSP430F2132 , MSP430F2232 , MSP430F2234 , MSP430F2252 , MSP430F2254 , MSP430F2272 , MSP430F2274 , MSP430F2274-EP , MSP430F233 , MSP430F2330 , MSP430F235 , MSP430F2350 , MSP430F2370 , MSP430F2410 , MSP430F2416 , MSP430F2417 , MSP430F2418 , MSP430F2419 , MSP430F247 , MSP430F2471 , MSP430F248 , MSP430F2481 , MSP430F249 , MSP430F249-EP , MSP430F2491 , MSP430F2616 , MSP430F2617 , MSP430F2618 , MSP430F2619 , MSP430F2619S-HT , MSP430FR2032 , MSP430FR2033 , MSP430FR2110 , MSP430FR2111 , MSP430FR2153 , MSP430FR2155 , MSP430FR2310 , MSP430FR2311 , MSP430FR2353 , MSP430FR2355 , MSP430FR2433 , MSP430FR2475 , MSP430FR2476 , MSP430FR2532 , MSP430FR2533 , MSP430FR2632 , MSP430FR2633 , MSP430FR2672 , MSP430FR2673 , MSP430FR2675 , MSP430FR2676 , MSP430FR4131 , MSP430FR4132 , MSP430FR4133 , MSP430G2001 , MSP430G2101 , MSP430G2102 , MSP430G2111 , MSP430G2112 , MSP430G2121 , MSP430G2131 , MSP430G2132 , MSP430G2152 , MSP430G2153 , MSP430G2201 , MSP430G2202 , MSP430G2203 , MSP430G2210 , MSP430G2211 , MSP430G2212 , MSP430G2213 , MSP430G2221 , MSP430G2230 , MSP430G2230-EP , MSP430G2231 , MSP430G2231-EP , MSP430G2232 , MSP430G2233 , MSP430G2252 , MSP430G2253 , MSP430G2302 , MSP430G2302-EP , MSP430G2303 , MSP430G2312 , MSP430G2313 , MSP430G2332 , MSP430G2332-EP , MSP430G2333 , MSP430G2352 , MSP430G2353 , MSP430G2402 , MSP430G2403 , MSP430G2412 , MSP430G2413 , MSP430G2432 , MSP430G2433 , MSP430G2444 , MSP430G2452 , MSP430G2453 , MSP430G2513 , MSP430G2533 , MSP430G2544 , MSP430G2553 , MSP430G2744 , MSP430G2755 , MSP430G2855 , MSP430G2955 , MSP430I2020 , MSP430I2021 , MSP430I2030 , MSP430I2031 , MSP430I2040 , MSP430I2041
The BSL is software that is used to reprogram the MCU, for example, during field firmware updates. On the F2xx family of devices, the BSL uses a Timer_A-based UART and is located in ROM. The BSL is not erasable or customizable by the user.
The FR4xx family follows a similar approach in which the BSL software is located in ROM. It cannot be erased or reprogrammed. For the BSL address range, see the device-specific data sheet. In terms of the communication interface, the FR4xx is also based on the UART protocol similar to the F2xx devices. However, the FR4xx uses the hardware eUSCI_A module to implement UART communication instead of using Timer_A. Hence, the module pins UCA0TXD and UCA0RXD are used for BSL communication. And the RST/NMI/SBWTDIO pin and TEST/SBWTCK pin are used for BSL entry sequence.
The BSL on the MSP430FR2x devices (except for the MSP430FR203x) supports both UART and I2C communication. This BSL scans the UART and I2C peripherals to detect which interface is used by the host programmer. When a transmission is detected on one of the peripherals, that interface is selected and the other is disabled by the BSL. On the F2xx family of devices, only the UART BSL is available. For details, see the MSP430 FRAM device bootloader (BSL) user's guide.
The BSL in the FR4xx family can be disabled by programming a specific signature to the BSL signature location. For details, see Table 3-2. Note that the location and length of the BSL signature is different from the F2xx family.
This process is documented in the SYS chapter in the MSP430FR4xx and MSP430FR2xx family user's guide.