STM32F051K6U6 Datasheet, PDF (19/40 Pages) STMicroelectronics – Low- and medium-density advanced ARM™-based 32-bit MCU with 16 to 64 Kbytes Flash, timers, ADC, DAC and comm. interfaces

STM32F051x
Functional overview
Table 6.
STM32F051xx USART implementation
USART modes/features⁽¹⁾
Hardware flow control for modem
Continuous communication using DMA
Multiprocessor communication
Synchronous mode
Smartcard mode
Single-wire half-duplex communication
IrDA SIR ENDEC block
LIN mode
Dual clock domain and wakeup from Stop mode
Receiver timeout interrupt
Modbus communication
Auto baud rate detection
Driver Enable
1. X = supported.
USART1
X
X
X
X
X
X
X
X
X
X
X
X
X
USART2
X
X
X
X
X
X
3.15
Serial peripheral interface (SPI)/Inter-integrated sound
interfaces (I²S)
Up to two SPIs are able to communicate up to 18 Mbits/s in slave and master modes in full-
duplex and simplex 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 I²S interface (multiplexed with SPI1) supporting four different audio standards
can operate as master or slave at simplex communication mode. It can be configured to
transfer 16 and 24 or 32 bits with16-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 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.
Refer to Table 7 for the differences between SPI1 and SPI2.
Table 7.
STM32F051x SPI/I2S implementation
SPI features⁽¹⁾
Hardware CRC calculation
Rx/Tx FIFO
NSS pulse mode
I2S mode
TI mode
1. X = supported.
SPI1
X
X
X
X
X
SPI2
X
X
X
X
Doc ID 018746 Rev 2
19/22