ST STM32WL55JC User Manual

Serial peripheral interface / integrated interchip sound (SPI/I2S) RM0453
1278/1454 RM0453 Rev 2
Figure 359. Master full-duplex communication in packed mode
Assumptions for master full-duplex communication in packed mode example:
• Data size = 5 bit
• Read/write FIFO is performed mostly by 16-bit access
• FRXTH=0
If DMA is used:
• Number of Tx frames to be transacted by DMA is set to 3
• Number of Rx frames to be transacted by DMA is set to 3
• PSIZE for both Tx and Rx DMA channel is set to 16-bit
• LDMA_TX=1 and LDMA_RX=1
See also : Communication diagrams on page 1274 for details about common assumptions
and notes.
4 3 2 1
10
NSS
SCK
BSY
MOSI
5
SPE
TXE
00
11
11 00
FTLVL
DTx1-2
DTx3-4
01
10
00
10
00 00
RXNE
DRx1-2
DRx3-4
DRx5
FRLVL
DMA Tx TICF
DMA Rx TICF
11
2
3
4
5
Enable Tx/Rx DMA or interrupts
DMA or software control at Tx events
DMA or software control at Rx events
10
DTx5
10
7
4 3 2 1
5
4 3 2 1
5
4 3 2 1
5
4 3 2 1
5
DTx1-2 DTx3-4 DTx5
5 4 3 2
1
5 4 3 2
1
5 4 3 2
1
5 4 3 2
1 1
5 4 3 2
MISO
DRx1-2
DRx3-4 DRx5
01
FRTHX=1
01
00
01
8
3
MSv32125V2

ST STM32WL55JC Specifications

General

Series	STM32WL
Speed	48MHz
Flash Memory	256 KB
RAM	64 KB
Voltage - Supply (Vcc/Vdd)	1.8 V ~ 3.6 V
RF Frequency	150MHz ~ 960MHz
Data Converters	A/D 12x12b; D/A 1x12b
ADC Channels	12
DAC Channels	1
Sub-GHz Radio	Yes
Core Processor	ARM Cortex-M4
Connectivity	I2C, SPI, UART
Oscillator Type	Internal
Operating Temperature	-40°C ~ 85°C
Communication Interfaces	I2C, SPI, USART
Wireless Connectivity	LoRa, Sigfox
Radio Frequency Range	150MHz ~ 960MHz
Peripherals	DMA, POR, PWM, WDT