FLEXIO_TIMCMPn field descriptions (continued)
Field
Description
trigger input, the compare register is used to set the number of bits in each word equal to (CMP[15:0] +
1) / 2.
47.4 Functional description
47.4.1 Shifter operation
Shifters are responsible for buffering and shifting data into or out of the FlexIO. The
timing of shift, load and store events are controlled by the Timer assigned to the Shifter
via the SHIFTCTL[TIMSEL] register. The Shifters are designed to support either DMA,
interrupt or polled operation. The following block diagram provides a detailed view of
the Shifter microarchitecture.
31
0
SHIFTBUFi
SHIFTERi
SSTOP
SSTART
timer_load_data/start/stop
timer_store_data
timer_shift_pos
S
FXIO_D0
S
FXIO_Dn
S = synchronizer
PINSEL
S1
out
INSRC
PINPOL
PINPOL
SHIFTERi
out
FXIO_D0
FXIO_Dn
timer_shift_neg
TIMPOL
PINSEL,
PINCFG
Figure 47-2. Shifter Microarchitecture
47.4.1.1 Transmit Mode
When configured for Transmit mode (SHIFTCTL[SMOD]=Transmit), the shifter will
load data from the SHIFTBUF register and shift data out when a load event is signalled
by the assigned Timer. An optional start/stop bit can also be automatically loaded before/
after SHIFTBUF data by configuring the SHIFTCFG[SSTART], TIMCFG[TSTART] or
SHIFTCFG[SSTOP], TIMCFG[TSTOP] registers in the Shifter and Timer. Note that the
shifter will immediately load a stop bit when the Shifter is initially configured for
Transmit mode if a stop bit is enabled.
Chapter 47 Flexible I/O (FlexIO)
Kinetis KE1xZ256 Sub-Family Reference Manual, Rev. 3, 07/2018
NXP Semiconductors
1245
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