FLEXIO_SHIFTCFGn field descriptions (continued)
Field
Description
3–2
Reserved
This field is reserved.
This read-only field is reserved and always has the value 0.
SSTART
Shifter Start bit
For SMOD=Transmit, this field allows automatic start bit insertion if the selected timer has also enabled a
start bit.
For SMOD=Receive or Match Store, this field allows automatic start bit checking if the selected timer has
also enabled a start bit.
00
Start bit disabled for transmitter/receiver/match store, transmitter loads data on enable
01
Start bit disabled for transmitter/receiver/match store, transmitter loads data on first shift
10
Transmitter outputs start bit value 0 before loading data on first shift, receiver/match store sets error
flag if start bit is not 0
11
Transmitter outputs start bit value 1 before loading data on first shift, receiver/match store sets error
flag if start bit is not 1
39.3.13 Shifter Buffer N Register (FLEXIO_SHIFTBUFn)
.
Address: 4005_F000h base + 200h (4d × i), where i=0d to 3d
Bit 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
0
R
W
Reset
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 0
FLEXIO_SHIFTBUFn field descriptions
Field
Description
SHIFTBUF
Shift Buffer
Shift 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 Shifter
contents. 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). In
Match Store mode, Shifter data [31:16] is written to SHIFTBUF[31:16] whenever a match event occurs.
Memory Map and Registers
KL27 Sub-Family Reference Manual , Rev. 5, 01/2016
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Freescale Semiconductor, Inc.
