> > Has anyone else had problems with an msp430 that works fine for a while, > and > > then suddenly will not respond to the jtag interface any more? > > This happens if your DC on programming adapter is unstable. JTAG needs very > precise voltage, at least on MSP430F149. > Another way to get this problem - if there is something on target board - > like LCD - that lowers 3.3V on board. I even had to disconnect LCD in order > to program through JTAG. Of course, it's only my problem - but you could > have similar one. >
That's worth thinking about, although I think it the vcc should be pretty stable (supplied from the board) most of the time. I have a LCD backlight that is turned on around startup - perhaps that is causing voltage spikes. But would that destroy the jtag interface on the chip?
