The BSL enables programming of the FRAM or RAM using a UART serial interface (FRxxxx devices) or an I2C interface (FRxxxx1 devices). Access to the device memory through the BSL is protected by an user-defined password. Use of the BSL requires four pins as shown in Table 6-5. BSL entry requires a specific entry sequence on the RST/NMI/SBWTDIO and TEST/SBWTCK pins. For complete description of the features of the BSL and its implementation, see MSP430 FRAM Device Bootloader (BSL) User's Guide.
|DEVICE SIGNAL||BSL FUNCTION|
|RST/NMI/SBWTDIO||Entry sequence signal|
|TEST/SBWTCK||Entry sequence signal|
|BSL_TX||Devices with UART BSL (FRxxxx): Data transmit|
|BSL_RX||Devices with UART BSL (FRxxxx): Data receive|
|BSL_DAT||Devices with I2C BSL (FRxxxx1): Data|
|BSL_CLK||Devices with I2C BSL (FRxxxx1): Clock|