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STM32F031x4 STM32F031x6 Functional overview
22
3.15 Serial peripheral interface (SPI) / Inter-integrated sound
interface (I
2
S)
The SPI is able to communicate up to 18 Mbit/s in slave and master modes in full-duplex
and half-duplex communication modes. The 3-bit prescaler gives 8 master mode
frequencies and the frame size is configurable from 4 bits to 16 bits.
One standard I
2
S interface (multiplexed with SPI1) supporting four different audio standards
can operate as master or slave at half-duplex communication mode. It can be configured to
transfer 16 and 24 or 32 bits with 16-bit or 32-bit data resolution and synchronized by a
specific signal. Audio sampling frequency from 8 kHz up to 192 kHz can be set by an 8-bit
programmable linear prescaler. When operating in master mode, it can output a clock for an
external audio component at 256 times the sampling frequency.
Table 8. STM32F031x4/x6 USART implementation
USART modes/features
(1)
1. X = supported.
USART1
Hardware flow control for modem X
Continuous communication using DMA X
Multiprocessor communication X
Synchronous mode X
Smartcard mode X
Single-wire half-duplex communication X
IrDA SIR ENDEC block X
LIN mode X
Dual clock domain and wakeup from Stop mode X
Receiver timeout interrupt X
Modbus communication X
Auto baud rate detection X
Driver Enable X
Table 9. STM32F031x4/x6 SPI/I
2
S implementation
SPI features
(1)
1. X = supported.
SPI
Hardware CRC calculation X
Rx/Tx FIFO X
NSS pulse mode X
I
2
S mode X
TI mode X
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