MSP430F551X_1 Datasheet, PDF (21/115 Pages) Texas Instruments – MIXED SIGNAL MICROCONTROLLER

MSP430F551x
MSP430F552x
www.ti.com
SLAS590D – OCTOBER 2009 – REVISED APRIL 2010
Bootstrap Loader (BSL)
The BSL enables users to program the flash memory or RAM using various serial interfaces. Access to the
device memory via the BSL is protected by an user-defined password. For complete description of the features of
the BSL and its implementation, see the MSP430 Memory Programming User's Guide, literature number
SLAU265.
USB BSL
All devices come pre-programmed with the USB BSL. Usage of the USB BSL requires external access to the six
pins shown in Table 5. In addition to these pins, the application must support external components necessary for
normal USB operation e.g. proper crystal on XT2IN and XT2OUT, proper decoupling, etc.
Table 5. USB BSL Pin Requirements and Functions
DEVICE SIGNAL
RST/NMI/SBWTDIO
PU.0/DP
PU.1/DM
PUR
VBUS
VSSU
BSL FUNCTION
Entry sequence signal
USB data terminal DP
USB data terminal DM
USB pullup resistor terminal
USB bus power supply
USB ground supply
UART BSL
A UART BSL is also available that can be programmed by the user into the BSL memory by replacing the
pre-programmed, factory supplied, USB BSL. Usage of the UART BSL requires external access to the six pins
shown in Table 6.
Table 6. UART BSL Pin Requirements and Functions
DEVICE SIGNAL
RST/NMI/SBWTDIO
TEST/SBWTCK
P1.1
P1.2
VCC
VSS
BSL FUNCTION
Entry sequence signal
Entry sequence signal
Data transmit
Data receive
Power supply
Ground supply
Copyright © 2009–2010, Texas Instruments Incorporated
Submit Documentation Feedback
21