
Table 29-2. LPSPI Command Word (continued)
Field
Description
Modify During Transfer
CONT
Configures for a continuous transfer that
keeps PCS asserted between frames
(as configured by FRAMESZ). A new
command word is required to cause
PCS to negate. Also supports changing
the command word at frame size
boundaries.
Y
CONTC
Indicates this is a new command word
for the existing continuous transfer. This
bit is ignored when not written to the
transmit/command FIFO on a frame
boundary.
Y
RXMSK
Masks the receive data and does not
store to the receive FIFO or perform
receive data matching. Useful for half-
duplex transfers or to configure which
fields are compared during receive data
matching.
Y
TXMSK
Masks the transmit data, so that data is
not pulled from transmit FIFO and the
output data pin is tristated (unless
configured by OUTCFG). Useful for half-
duplex transfers.
Y
WIDTH
Configures the number of bits shifted on
each LPSPI_SCK pulse. Single bit
transfers support traditional SPI bus
transfers in either half-duplex or full-
duplex data formats. Two and four bit
transfers are useful for interfacing to
QuadSPI memory devices and only
support half-duplex data formats (at
least one of TXMSK or RXMSK must
also be set).
Y
FRAMESZ
Configures the number of bits in each
frame to 1. The minimum
frame size is 8-bits and the maximum
frame size is 4096-bits. If the frame size
is less than or equal to 32-bits, the word
size and frame size are identical. If the
frame size is greater than 32-bits, then
the word size is 32-bits for each word
except the last (the last word contains
the remainder bits if the frame size is not
divisible by 32). The minimum word size
is 2-bits, a frame size of 33-bits (or
similar) is not supported.
Y
The LPSPI initiates a SPI bus transfer when data is written to the transmit FIFO, the
HREQ pin is asserted (or disabled) and the LPSPI is enabled. The SPI bus transfer uses
the attributes configured in the transmit command register and timing parameters from
the clock configuration register to perform the transfer. The SPI bus transfer ends once
Functional description
K32 L2A Reference Manual, Rev. 2, 01/2020
788
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...