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3.3 Bootstrap Loader
FET430UIF supplies target) OR pin 4 (target is externally supplied) must
be connected, not both at the same time.
When an MSP-FET430X110 is powered from an external supply, an on-
board device regulates the external voltage to the level required by the
MSP430.
When a Target Socket module is powered from an external supply, the
external supply powers the device on the Target Socket module and any
user circuitry connected to the Target Socket module, and the FET
Interface module continues to be powered from the PC via the parallel
port. If the externally supplied voltage differs from that of the FET
Interface module, the Target Socket module must be modified so that the
externally supplied voltage is routed to the FET Interface module (so that
it may adjust its output voltage levels accordingly). Again, refer to the
Target Socket module schematics in 38).
The JTAG pins provide access to the Flash memory of the MSP430Fxxx
devices. On some devices, these pins are shared with the device port
pins, and this sharing of pins can complicate a design (or it may simply
not be possible to do so). As an alternative to using the JTAG pins, most
MSP430Fxxx devices contain a program (a "Bootstrap Loader") that
permits the Flash memory to be erased and programmed simply, using a
reduced set of signals. Application Notes SLAA089 and SLAA096 fully
describe this interface. TI does not produce a BSL tool. However,
customers can easily develop their own BSL tools using the information
in the Application Notes, or BSL tools can be purchased from 3
Refer to the MSP430 web site for the Application Notes and a list of
rd
MSP430 3
party tool developers.
Texas Instruments suggests that MSP430Fxxx customers design their
circuits with the BSL in mind (i.e., we suggest providing access to these
signals, e.g. via a header).
Refer to FAQ, Hardware #9) for a second alternative to sharing the JTAG
and port pins.
The BSL tool requires the following device signals:
RST/NMI
TEST†
TCK†
GND
VCC
P1.1
P2.2 or P1.0‡
† If present on device.
‡ '1xx / '2xx devices use pins P1.1 and P2.2 for the BSL. '4xx devices use pins P1.0 and
P1.1 for the BSL.
rd
parties.
3-5
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