A problem that must be paid attention to during the simulation download of JTAG in the joint port of MSP430

Today, it has been a long time since the JTAG download problem of MSP430.

In the end, it is actually a problem with the port mode. In My bios, the default port is the SSP mode, but if JTAG is used, it needs to be changed to the ECP or EPP mode. after entering the BIOS to correct it, there is no problem, debugging is now available.

There is another problem that I don't know why. I have bought a 430 Development Board for a long time and used it out. The JTAG download won't work (after solving the problem above). I finally checked the power supply, sure enough, there was a problem. The 430 VCC pin had only 0.8v pressure drop to the ground, and it had not been found for a long time. Even the test pressure drop of the USB power supply port is only 3.8 V. If I do not insert a 430 backboard, the pressure drop of the USB power supply port is 5 V, but the output of the 3.3v Voltage Regulator chip is only 2.9 v. Why? It is even worse after plugging it in, regulator output only 0.8 V .... It's speechless...

Hope you can see it and answer it.