STM32WLE4JC datasheet(46/146 Pages) STMICROELECTRONICS

46 / 146 page

Functional overview

STM32WLE5/E4xx

46/146

DS13105 Rev 9

•

PMBus (power system management protocol) specification rev 1.1 compatibility

•

independent clock: a choice of independent clock sources allowing the I2C

communication speed to be independent from the PCLK reprogramming (see Figure 8)

•

wakeup from Stop mode on address match

•

programmable analog and digital noise filters

•

1-byte buffer with DMA capability

3.28

Universal synchronous/asynchronous receiver transmitter

(USART/UART)

The devices embed two universal synchronous receiver transmitters, USART1 and

USART2 (see Table 16 for the implementation details).

Each USART provides asynchronous communication, IrDA SIR ENDEC support,

multiprocessor communication mode, single-wire half-duplex communication mode. Each

USART has LIN Master/Slave capability and provides hardware management of the CTS

and RTS signals, and RS485 driver enable.

The USART is able to communicate at speeds of up to 4 Mbit/s, and also provides

Smart Card mode (ISO 7816 compliant) and SPI-like communication capability.

The USART supports synchronous operation (SPI mode), and can be used as an SPI

master.

The USART has a clock domain independent from the CPU clock, allowing the USART to

wake up the MCU from Stop mode, using baudrates up to 200 kbaud.

The wakeup events from Stop mode are programmable and can be one of the following:

•

start bit detection

•

any received data frame

•

a specific programmed data frame

Table 15. I2C implementation

I2C features(1)

1. X = supported.

I2C1(2)

2. The register content is lost in Stop 2 mode.

I2C2(2)

I2C3

7-bit addressing mode

10-bit addressing mode

Standard-mode (up to 100 Kbit/s)

Fast-mode (up to 400 Kbit/s)

Fast-mode Plus with 20mA output drive I/Os (up to 1 Mbit/s)

Independent clock

Wakeup from Stop mode

X(3)

3. Wakeup supported from Stop 0 and Stop 1 modes.

X(3)

X(4)

4. Wakeup supported from Stop 0, Stop 1 and Stop 2 modes.

SMBus/PMBus

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