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MSP430I2041: JTAG and UART signals

Koichiro Tashiro
Mastermind 21640 points
Part Number: MSP430I2041

Hi,

My customer is considering to use UART (UCA0TX and UCA0RX) in their system, but these signals are multiplexed with JTAG signals.
Datasheet Table 7-1:


Q1) Is there no option to use standard JTAG in such usecase?
Q2) There is Spy-By-Wire as another option.
What is exactly difference(s) between JTAG and Spy-By-Wire, performance, features, etc.?

Thanks and regards,
Koichiro Tashiro

  • +1
    TI__Guru 56685 points

    Hello,

    The recommendation would be to utilize SBW programming interface to reduce pin count utilized for production programming. SBW has same capabilities as full 4-wire JTAG, it is just time sliced and therefore slower than JTAG. Also due to the time slicing, it is timing dependant. This means care must be taken on how much capacitance is on the SBW lines from a layout and passive perspective. SBW is the typical programming interface utilized for MSP430 devices. 

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