SLAZ171O October 2012 – May 2021 MSP430F2330
USCI Module
Functional
Receive buffer overrun undetected
When a new character is being loaded into RXBUF by the USCI hardware, the previous character may be overwritten. This can occur when the USCI hardware updates RXBUF with the new character and in the same instant the CPU accesses RXBUF to read the old character. In this case, the old character is lost and the new one is read out. No receive overrun error will be detected and UCOE will not be set.
Running the CPU at an adequate speed in order to guarantee access of RXBUF of received characters prior to new character receive completion will minimize the potential that simultaneous access of RXBUF may happen.