Disabled.
Receive mode. Captures the current Shifter content into the SHIFTBUF on expiration of the Timer.
Transmit mode. Load SHIFTBUF contents into the Shifter on expiration of the Timer.
Match Store mode. Shifter data is compared to SHIFTBUF content on expiration of the Timer.
Match Continuous mode. Shifter data is continuously compared to SHIFTBUF contents.
State mode. SHIFTBUF contents are used for storing programmable state attributes.
Logic mode. SHIFTBUF contents are used for implementing programmable logic look up table.