[quote userid="651005" url="~/support/microcontrollers/msp-low-power-microcontrollers-group/msp430/f/msp-low-power-microcontroller-forum/1502946/msp430fr6922-urgent-uart-communication-freeze-on-msp430fr6922-in-water-meter-mass-production/5774750#5774750"]the failure rate is around 2 0% .[/quote] Dose the product is a new designed in production? [quote userid="651005" url="~/support/microcontrollers/msp-low-power-microcontrollers-group/msp430/f/msp-low-power-microcontroller-forum/1502946/msp430fr6922-urgent-uart-communication-freeze-on-msp430fr6922-in-water-meter-mass-production/5774750#5774750"] ACLK (32.768 kHz) [/quote] What's the clock source of the ACLK, internal clock or external crystal? By the way, to debug this kind of issue, read the internal registers status is very helpful when the issue happen. If you create the project by CCS, you can also load symbol to debug it directly. Here is a guide line how to read the registers with out reset the device. e2e.ti.com/.../3005.Read-MSP430-PC-counter-and-register.pdf You can read the register of UART to see if the registers is correctly configured.
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