SPIThe serial peripheral interface (SPI1) provides half/ full duplex synchronous serialcommunication with external devices.•Maximum speed: 8 Mbit/s (fSYSCLK/2) both for master and slave•Full duplex synchronous transfers•Simplex synchronous transfers on 2 lines with a possible bidirectional data line•Master or slave operation - selectable by hardware or software•Hardware CRC calculation•Slave/master selection input pinNote:SPI1 can be served by the DMA1 Controller.3.15.2I2CThe I2C bus interface (I2C1) provides multi-master capability, and controls all I2C bus-specific sequencing, protocol, arbitration and timing.•Master, slave and multi-master capability•Standard mode up to 100 kHz and fast speed modes up to 400 kHz.•7-bit and 10-bit addressing modes.•SMBus 2.0 and PMBus support•Hardware CRC calculationNote:I2C1 can be served by the DMA1 Controller.3.15.3USARTThe USART interface (USART1) allows full duplex, asynchronous communications withexternal devices requiring an industry standard NRZ asynchronous serial data format. Itoffers a very wide range of baud rates.•1 Mbit/s full duplex SCI•SPI1 emulation•High precision baud rate generator•SmartCard emulation•IrDA SIR encoder decoder•Single wire half duplex modeNote:USART1 can be served by the DMA1 Controller.3.16Infrared (IR) interfaceThe low-density STM8L151x2/3 devices contain an infrared interface which can be usedwith an IR LED for remote control functions. Two timer output compare channels are used togenerate the infrared remote control signal
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