
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,
PINWIDTH
S1
out
INSRC
PINPOL
PINPOL
SHIFTERi
out
FXIO_D0
FXIO_Dn
timer_shift_neg
TIMPOL
PINSEL,
PINWIDTH,
PINCFG
Figure 22-2. Shifter Microarchitecture
22.3.1.1 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.
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.
22.3.1.2 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.
Functional description
K32 L2A Reference Manual, Rev. 2, 01/2020
566
NXP Semiconductors
Содержание K32 L2A Series
Страница 2: ...K32 L2A Reference Manual Rev 2 01 2020 2 NXP Semiconductors...
Страница 42: ...K32 L2A Reference Manual Rev 2 01 2020 42 NXP Semiconductors...
Страница 122: ...Flash Memory Clock K32 L2A Reference Manual Rev 2 01 2020 122 NXP Semiconductors...
Страница 146: ...Module operation in low power modes K32 L2A Reference Manual Rev 2 01 2020 146 NXP Semiconductors...
Страница 158: ...Debug and security K32 L2A Reference Manual Rev 2 01 2020 158 NXP Semiconductors...
Страница 174: ...Module Signal Description Tables K32 L2A Reference Manual Rev 2 01 2020 174 NXP Semiconductors...
Страница 246: ...Application information K32 L2A Reference Manual Rev 2 01 2020 246 NXP Semiconductors...
Страница 322: ...Kinetis Bootloader Status Error Codes K32 L2A Reference Manual Rev 2 01 2020 322 NXP Semiconductors...
Страница 344: ...Application initialization information K32 L2A Reference Manual Rev 2 01 2020 344 NXP Semiconductors...
Страница 374: ...CMP Trigger Mode K32 L2A Reference Manual Rev 2 01 2020 374 NXP Semiconductors...
Страница 384: ...Functional description K32 L2A Reference Manual Rev 2 01 2020 384 NXP Semiconductors...
Страница 592: ...Application Information K32 L2A Reference Manual Rev 2 01 2020 592 NXP Semiconductors...
Страница 602: ...Initialization and application information K32 L2A Reference Manual Rev 2 01 2020 602 NXP Semiconductors...
Страница 656: ...Functional Description K32 L2A Reference Manual Rev 2 01 2020 656 NXP Semiconductors...
Страница 664: ...Functional Description K32 L2A Reference Manual Rev 2 01 2020 664 NXP Semiconductors...
Страница 744: ...Functional description K32 L2A Reference Manual Rev 2 01 2020 744 NXP Semiconductors...
Страница 762: ...Functional description K32 L2A Reference Manual Rev 2 01 2020 762 NXP Semiconductors...
Страница 806: ...Functional description K32 L2A Reference Manual Rev 2 01 2020 806 NXP Semiconductors...
Страница 868: ...Integer square root K32 L2A Reference Manual Rev 2 01 2020 868 NXP Semiconductors...
Страница 976: ...Functional description K32 L2A Reference Manual Rev 2 01 2020 976 NXP Semiconductors...
Страница 1012: ...Functional description K32 L2A Reference Manual Rev 2 01 2020 1012 NXP Semiconductors...
Страница 1094: ...Functional description K32 L2A Reference Manual Rev 2 01 2020 1094 NXP Semiconductors...
Страница 1132: ...Functional description K32 L2A Reference Manual Rev 2 01 2020 1132 NXP Semiconductors...
Страница 1182: ...Functional description K32 L2A Reference Manual Rev 2 01 2020 1182 NXP Semiconductors...
Страница 1290: ...Functional description K32 L2A Reference Manual Rev 2 01 2020 1290 NXP Semiconductors...
Страница 1344: ...USB Voltage Regulator Module Signal Descriptions K32 L2A Reference Manual Rev 2 01 2020 1344 NXP Semiconductors...
Страница 1356: ...Initialization Application Information K32 L2A Reference Manual Rev 2 01 2020 1356 NXP Semiconductors...