ZHCSDO6B May 2015 – September 2020 MSP430FG6425 , MSP430FG6426 , MSP430FG6625 , MSP430FG6626
PRODUCTION DATA
The devices MSP430FG6626 and MSP430FG6625 are preprogrammed with the USB BSL. Use of the USB BSL requires external access to six pins (see Table 9-4). In addition to these pins, the application must support external components necessary for normal USB operation; for example, the proper crystal on XT2IN and XT2OUT, proper decoupling, and so on. For additional information, see the MSP430™ Flash Device Bootloader (BSL) User's Guide.
DEVICE SIGNAL | BSL FUNCTION |
---|---|
RST/NMI/SBWTDIO | Entry sequence signal |
PU.0/DP | USB data terminal DP |
PU.1/DM | USB data terminal DM |
PUR | USB pullup resistor terminal |
VBUS | USB bus power supply |
VSSU | USB ground supply |
The default USB BSL evaluates the logic level of the PUR pin after a BOR reset. If it is pulled high externally, then the BSL is invoked. Therefore, unless the application is invoking the BSL, it is important to keep PUR pulled low after a BOR reset, even if BSL or USB is never used. TI recommends applying a 1-MΩ resistor to ground.