Bootstrap Loader (Bsl) - Texas Instruments MSP430F5529 Manual

MSP430F5529, MSP430F5528, MSP430F5527, MSP430F5526
MSP430F5525, MSP430F5524, MSP430F5522, MSP430F5521
MSP430F5519, MSP430F5517, MSP430F5515, MSP430F5514, MSP430F5513
SLAS590M – MARCH 2009 – REVISED NOVEMBER 2015
6.5

Bootstrap Loader (BSL)

The BSL enables users to program the flash memory or RAM using various serial interfaces. Access to
the device memory by the BSL is protected by an user-defined password. For further details on interfacing
to development tools and device programmers, see the MSP430 Hardware Tools User's Guide
(SLAU278). For complete description of the features of the BSL and its implementation, see the MSP430
Programming Via the Bootstrap Loader User's Guide (SLAU319).
6.5.1 USB BSL
All devices come preprogrammed with the USB BSL. Use of the USB BSL requires external access to the
six pins shown in Table
necessary for normal USB operation; for example, the proper crystal on XT2IN and XT2OUT, proper
decoupling, and so on.
The default USB BSL evaluates the logic level of the PUR pin after a BOR reset. If the PUR
pin 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.
6.5.2 UART BSL
A UART BSL is also available that can be programmed by the user into the BSL memory by replacing the
preprogrammed, factory supplied, USB BSL. Use of the UART BSL requires external access to the six
pins shown in Table
54 Detailed Description
Product Folder Links:
MSP430F5522 MSP430F5521 MSP430F5519 MSP430F5517 MSP430F5515 MSP430F5514 MSP430F5513
6-3. In addition to these pins, the application must support external components
Table 6-3. USB BSL Pin Requirements and Functions
DEVICE SIGNAL
PU.0/DP
PU.1/DM
PUR
VBUS
VSSU
6-4.
Table 6-4. UART BSL Pin Requirements and Functions
DEVICE SIGNAL
RST/NMI/SBWTDIO
TEST/SBWTCK
P1.1
P1.2
VCC
VSS
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MSP430F5529 MSP430F5528 MSP430F5527 MSP430F5526 MSP430F5525 MSP430F5524
BSL FUNCTION
USB data terminal DP
USB data terminal DM
USB pullup resistor terminal
USB bus power supply
USB ground supply
NOTE
BSL FUNCTION
Entry sequence signal
Entry sequence signal
Data transmit
Data receive
Power supply
Ground supply
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