The Shifter Status Flag (SHIFTSTAT[SSF]) and any enabled interrupts or DMA requests
will set when data has been loaded from the SHIFTBUF register into the Shifter or when
the Shifter is initially configured into Transmit mode. The flag will clear when new data
has been written into the SHIFTBUF register.
The Shifter Error Flag (SHIFTERR[SEF]) and any enabled interrupts will set when an
attempt to load data from an empty SHIFTBUF register occurs (buffer underrun). The
flag can be cleared by writing it with logic 1.
49.4.1.2 Receive Mode
When configured for Receive mode (SHIFTCTL[SMOD]=Receive), the shifter will shift
data in and store data into the SHIFTBUF register when a store event is signalled by the
assigned Timer. Checking for a start/stop bit can be enabled before/after shifter data is
sampled by configuring the SHIFTCFG[SSTART], TIMCFG[TSTART] or
SHIFTCFG[SSTOP], TIMCFG[TSTOP] registers in the Shifter and Timer.
The Shifter Status Flag (SHIFTSTAT[SSF]) and any enabled interrupts or DMA requests
will set when data has been stored into the SHIFTBUF register from the Shifter. The flag
will clear when the data has been read from the SHIFTBUF register.
The Shifter Error Flag (SHIFTERR[SEF]) and any enabled interrupts will set when an
attempt to store data into a full SHIFTBUF register occurs (buffer overrun) or when a
mismatch occurs on a start/stop bit check. The flag can be cleared by writing it with logic
1.
49.4.1.3 Match Store Mode
When configured for Match Store mode (SHIFTCTL[SMOD]=Match Store), the shifter
will shift data in, check for a match result and store matched data into the SHIFTBUF
register when a store event is signalled by the assigned Timer. Checking for a start/stop
bit can be enabled before/after shifter data is sampled by configuring the
SHIFTCFG[SSTART], TIMCFG[TSTART] or SHIFTCFG[SSTOP], TIMCFG[TSTOP]
registers in the Shifter and Timer. Up to 16-bits of data can be compared using
SHIFTBUF[31:16] to configure the data to be matched and SHIFTBUF[15:0] to mask the
match result.
The Shifter Status Flag (SHIFTSTAT[SSF]) and any enabled interrupts or DMA requests
will set when a match occurs and matched data has been stored into the SHIFTBUF
register from the Shifter. The flag will clear when the matched data has been read from
the SHIFTBUF register.
Functional description
Kinetis KE1xF Sub-Family Reference Manual, Rev. 4, 06/2019
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NXP Semiconductors
Содержание KE1xF Series
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