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LPSPI
External devices
Or DMA
Slaves
MCU System-on-a-Chip (SoC)
Cores or DMA in an MCU SoC use LPSPI to communicate
with external devices over a serial bus.
SPI bus
Cores
Masters
Figure 45-2. LPSPI connects masters in MCU to external slaves on PCB
Communications
LPSPI
Liquid crystal
Flash, EEPROM
Memories
SPI bus
Cores and DMA modules in MCU SoC use LPSPI
Slave-only devices
Synchronous
Sensors
ADC, touchscreens,
MCU System-on-a-Chip (SoC)
DMA
Core 1
Core
N
Masters
to connect to external peripherals that use an SPI bus.
Many devices can be connected to the LPSPI
,
but only 1 device can be accessed at a time
.
to external clock
Bus
Fabric
Bus fabric can be crossbar switches, NICs, or combinations
of crossbar switches, NICs, and similar modules.
Secure digital cards
Ethernet, USB, CAN,
MMC, SD, SDIO
displays (LCD)
USART
temperature
Figure 45-3. Typical LPSPI connection scheme
• SPI accesses are always synchronous to the external clock.
• Each SPI can only assert one chip select at a time, but technically there can be
multiple SPI slaves sharing the same chip select (in the form of a larger shift
register). This requires:
• the SDO of the master to connect to the SDI of the first slave,
• the SDO of first slave to connect to the SDI of the next slave,
• and the SDO of last slave to connect to the SDI of the LPSPI master.
Note that some SPI modules use MISO/MOSI for the input/output data.
• The LPSPI supports DMA accesses and generates a DMA request.
Chapter 45 Low Power Serial Peripheral Interface (LPSPI)
MWCT101xS Series Reference Manual, Rev. 3, 07/2019
NXP Semiconductors
1369
Содержание MWCT101 S Series
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