SPRUIE9D May 2017 – May 2024 DRA74P , DRA75P , DRA76P , DRA77P
To allow complete software flexibility when transmitting and receiving infrared data packets, the SIR free-format (FF) mode is a subfunction of the existing SIR mode. In FF mode, all frames going to and from the FIFO buffers are untouched with respect to appending and removing control characters and CRC values.
The FF mode corresponds to a UART mode with a pulse modulation of 3/16 of baud rate pulse width.
For example, a normal SIR packet has BOF control and CRC error-checking data appended (transmitting) or removed (receiving) from the data going to and from the FIFOs.
Figure 26-44 shows SIR FF mode.
Figure 26-44 SIR FF ModeIn SIR FF mode, the MPU software must construct (that is, encode and decode) the entire FIFO data packet.