SPRUIE9D May 2017 – May 2024 DRA74P , DRA75P , DRA76P , DRA77P
The receive data-ready interrupt (RDATA) is generated if RDATA is 1 in the MCASP_RXSTAT register and RDATA is enabled in MCASP_EVTCTLR. The Section 26.6.4.10.1, Data Ready Status and Event/Interrupt Generation, provides details on when RDATA flag is set in the MCASP_RXSTAT register.
A receiver start of frame (RSTAFRM) interrupt is triggered by the recognition of a receiver frame sync.
A receiver last slot (RLAST) interrupt is a qualified version of the data ready interrupt (RDATA). It has the same behavior as the data ready interrupt, but is further qualified by having the data in the buffer come from the last TDM time slot (the slot that just ended was last TDM slot).