STM32L151CBT6 Datasheet, PDF (29/121 Pages) STMicroelectronics – Ultra-low-power 32-bit MCU ARM-based Cortex-M3, 128KB Flash, 16KB SRAM, 4KB EEPROM, LCD, USB, ADC, DAC

STM32L151x6/8/B, STM32L152x6/8/B
Functional overview
3.15.5
Window watchdog (WWDG)
The window watchdog is based on a 7-bit downcounter that can be set as free-running. It
can be used as a watchdog to reset the device when a problem occurs. It is clocked from the
main clock. It has an early warning interrupt capability and the counter can be frozen in
debug mode.
3.16
3.16.1
3.16.2
3.16.3
3.16.4
Communication interfaces
I²C bus
Up to two I²C bus interfaces can operate in multimaster and slave modes. They can support
standard and fast modes.
They support dual slave addressing (7-bit only) and both 7- and 10-bit addressing in master
mode. A hardware CRC generation/verification is embedded.
They can be served by DMA and they support SM Bus 2.0/PM Bus.
Universal synchronous/asynchronous receiver transmitter (USART)
All USART interfaces are able to communicate at speeds of up to 4 Mbit/s. They provide
hardware management of the CTS and RTS signals. They support IrDA SIR ENDEC, are
ISO 7816 compliant and have LIN Master/Slave capability.
All USART interfaces can be served by the DMA controller.
Serial peripheral interface (SPI)
Up to two SPIs are able to communicate at up to 16 Mbits/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 is configurable to 8 bits or 16 bits. The hardware CRC
generation/verification supports basic SD Card/MMC modes.
Both SPIs can be served by the DMA controller.
Universal serial bus (USB)
The STM32L15xxx embeds a USB device peripheral compatible with the USB full speed
12 Mbit/s. The USB interface implements a full speed (12 Mbit/s) function interface. It has
software-configurable endpoint setting and supports suspend/resume. The dedicated
48 MHz clock is generated from the internal main PLL (the clock source must use a HSE
crystal oscillator).
Doc ID 17659 Rev 8
29/121