4.8.8 Shut Down State Machine

Shut down state machine switches off all blocks previously enabled by another state machine. This includes the DSP blocks as the demodulator, channel filter as well as the analog blocks in the RF front end such as, LNA, IF amplifier, PLL and ADC. Only the XTO is kept on to allow the system to go back to IDLEMode(XTO).

If configured in SETRPA/B, the transparent outputs get disabled too.

It is strongly recommended that the shut down state machine be started after a software-induced state machine stop via the SSMRR.SSMST signal to revert most of the changes made previously by the SSM. In this case, the FSEN.ANTT bit needs to be reset before starting the shut down state machine, as it has the potential to block the shutdown process. Neither the changes to setting registers as EOTC and SOTC nor changes of tuning registers as FEVCT or FEAT are undone.