A.2 Known Issues
MSP-FET430UIF
Current detection algorithm of the UIF firmware
Problem Description
If high current is detected, the I
CC
monitor algorithm stays in a loop of frequently switching on and off the target
power supply. This power switching puts some MSP430 devices such as the MSP430F5438 in a state that
requires a power cycle to return the device to JTAG control.
A side issue is that if the UIF firmware has entered this switch on and switch off loop, it is not possible to turn off
the power supply to the target by calling MSP430_VCC(0). A power cycle is required to remove the device from
this state.
Solution
IAR KickStart and Code Composer Essentials that have the MSP430.dll version 2.04.00.003 and higher do not
show this problem. Update the software development tool to this version or higher to update the MSP-
FET430UIF firmware.
MSP-FET430PIF
Some PCs do not supply 5 V through the parallel port
Problem Description
Device identification problems with modern PCs, because the parallel port often does not deliver 5 V as was
common with earlier hardware.
1. When connected to a laptop, the test signal is clamped to 2.5 V.
2. When the external V
CC
becomes less than 3 V, up to 10 mA is flowing in the adapter through pin 4 (sense).
Solution
Measure the voltage level of the parallel port. If it is too low, provide external 5 V to the V
CC
pads of the interface.
The jumper on a the target socket must be switched to external power.
Frequently Asked Questions and Known Issues
28
MSP430™ Hardware Tools
SLAU278AG – MAY 2009 – REVISED DECEMBER 2020
Copyright © 2020 Texas Instruments Incorporated
