Datasheet

DocID15962 Rev 13 23/131
STM8L151xx, STM8L152xx Functional overview
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3.17 Communication interfaces
3.17.1 SPI
The serial peripheral interface (SPI1) provides half/ full duplex synchronous serial
communication with external devices.
 Maximum speed: 8 Mbit/s (f
SYSCLK
/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 pin
Note: SPI1 can be served by the DMA1 Controller.
3.17.2 I²C
The I
2
C bus interface (I
2
C1) 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 calculation
Note: I
2
C1 can be served by the DMA1 Controller.
3.17.3 USART
The USART interface (USART1) allows full duplex, asynchronous communications with
external devices requiring an industry standard NRZ asynchronous serial data format. It
offers 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 mode
Note: USART1 can be served by the DMA1 Controller.
3.18 Infrared (IR) interface
The medium density STM8L15x devices contain an infrared interface which can be used
with an IR LED for remote control functions. Two timer output compare channels are used to
generate the infrared remote control signals.