Datasheet

STM8L052R8 Functional overview
Doc ID 023133 Rev 2 19/55
3.13 Beeper
The beeper function outputs a signal on the BEEP pin for sound generation. The signal is in
the range of 1, 2 or 4 kHz.
3.14 Communication interfaces
3.14.1 SPI
The serial peripheral interfaces (SPI1 and SPI2) provide 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 and SPI2 can be served by the DMA1 Controller.
3.14.2 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.
3.14.3 USART
The USART interfaces (USART1, USART2 and USART3) allow 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, USART2 and USART3 can be served by the DMA1 Controller.