FLEXIO_SHIFTCFGn field descriptions (continued)Field Description3–2ReservedThis field is reserved.This read-only field is reserved and always has the value 0.SSTART Shifter Start bitFor SMOD=Transmit, this field allows automatic start bit insertion if the selected timer has also enabled astart bit.For SMOD=Receive or Match Store, this field allows automatic start bit checking if the selected timer hasalso enabled a start bit.00 Start bit disabled for transmitter/receiver/match store, transmitter loads data on enable01 Start bit disabled for transmitter/receiver/match store, transmitter loads data on first shift10 Transmitter outputs start bit value 0 before loading data on first shift, receiver/match store sets errorflag if start bit is not 011 Transmitter outputs start bit value 1 before loading data on first shift, receiver/match store sets errorflag if start bit is not 139.3.13 Shifter Buffer N Register (FLEXIO_SHIFTBUFn).Address: 4005_F000h base + 200h offset + (4d × i), where i=0d to 3dBit 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0R SHIFTBUFWReset 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0FLEXIO_SHIFTBUFn field descriptionsField DescriptionSHIFTBUF Shift BufferShift buffer data is used for a variety of functions depending on the SMOD setting:For SMOD=Receive, Shifter data is transferred into SHIFTBUF at the expiration of Timer.For SMOD=Transmit, SHIFTBUF data is transferred into the Shifter before the Timer begins.For SMOD=Match Store/Continuous, SHIFTBUF[31:16] contains the data to be matched with the Shiftercontents. The Match is checked either continuosly (Match Continous mode) or when the Timer expires(Match Store mode). SHIFTBUF[15:0] can be used to mask the match result (1=mask, 0=no mask). InMatch Store mode, Shifter data [31:16] is written to SHIFTBUF[31:16] whenever a match event occurs.Memory Map and RegistersKL27 Sub-Family Reference Manual , Rev. 5, 01/2016760 Freescale Semiconductor, Inc.
