JAJSBT6E October 2012 – September 2020 MSP430F5358 , MSP430F5359 , MSP430F5658 , MSP430F5659 , MSP430F6458 , MSP430F6459 , MSP430F6658 , MSP430F6659
PRODUCTION DATA
The devices MSP430F565x and MSP430F665x come preprogrammed with the USB BSL. Use of the USB BSL requires external access to six pins (see Table 9-5). 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 or proper decoupling.
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.