Texas Instruments ADS1230REF User Manual page 23

www.ti.com
6.6 Programming Connections
The MSP430 can be programmed via the dedicated JTAG port or the serial bootstrap loader.
The JTAG connector is not factory-installed. The footprint is similar to an edge-card pattern, and accepts a
standard dual-row 0.100in header mounted on the side of the board. This header is compatible with
MSP430 parallel-port JTAG adaptors.
To allow firmware to be downloaded through USB, U4 is connected to the microcontroller bootstrap loader
pins. The DTR and RTS pins are connected to the RST and TCK inputs on the microcontroller to allow the
serial bootstrap loader to operate. These lines are not isolated; instead, they are switched through SW9,
which also connects USB ground and power to the microcontroller ground and power. Normally this switch
is open; it is only switched on when firmware is to be downloaded through USB. This feature also protects
the microcontroller from unknown states on these pins at power-up.
SBAU125A – August 2007 – Revised September 2007
Submit Documentation Feedback
Hardware
ADS1230REF User's Guide 23